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After seeing the entire base roster, I noticed that there are some costumes that weren't added in the game and thought that they should have been added from the beginning. While I think so of them will be added in a future DLC, I imagine that some of the ones I found will only be made as a mod. Here's an extremely long list of costumes that could/should be made. (This list will update as I find new images and references. This is by no means as a way to ask/force someone to make these skins if they do not choose to.) Once the DLC characters are available, I will update the list to add their costumes in as well.

Goku (Z/Super): Android Saga - Driving Outfit and Pre-Cell Games Casual Outfit, Super - Farmer Outfit, End of Z Outfit, Resurrection F Gi - No Symbol, Ginyu w/ Turtle School Gi, Journey to the West Outfit, Goku (Xeno), Goku (SDBH), DB FighterZ - Clone

Goku (Super Saiyan 4): Goku (Xeno - Super Saiyan 4)

Goku (Super Saiyan God/Super Saiyan Blue): Goku (SDBH)

Goku (Ultra Instinct - Sign/Mastered): SDBH - Grand Priest Outfit

Goku (Early): 23rd World Martial Arts Tournament

Goku (Kid): Blue-Purple Gi, Red Gi, Shu's Clothes, Goku"s Doll *(Created by Mr. Popo.) *

Vegeta (Z/Super): Saiyan Saga Armor (Early Anime Colors), Badman Outfit, Pre-Buu Saga/Training Outfit, Resurrection F Armor - No Symbol, Vegeta (Xeno), Vegeta (SDBH - Grey + Blue Battlesuit), Duplicate Vegeta, Dragon Ball FighterZ - Clone

Vegeta (Super Saiyan 4): Vegeta (Xeno - Super Saiyan 4)

Vegeta (Super Saiyan God/Super Saiyan Blue): Vegeta (SDBH - Grey + Blue Battlesuit)

Majin Vegeta: Xenoverse Villainous Mode/Supervillain/Ultra Supervillain, Duplicate Vegeta, Time Breaker Vegeta

Gohan (Kid): Pre-Saiyan Saga Outfit (With + without Hat), Orange Gi *(After Piccolo blows up the moon) *, Saiyan Saga Gi with Headband, Pre-Android Saga Saiyan Armor *(Mecha Frieza's arrival) *, Android Saga Gi *(Buu Saga Shoes) *, Journey to the West Outfit

Gohan (Teen): Pre-Cell Games Casual Outfit/White Gi

Gohan (Adult): Gohan (Future) Pre-Battle Damage, Orange Star High School Outfit, Supreme Kai Outfit, Gohan (Xeno), Xenoverse Villainous Mode/Supervillain, DB FighterZ - Clone

Ultimate/Mystic Gohan: Early Buu Saga Gi/Outfit 1

Gohan (Future): Future Warrior in Black

Piccolo: 23rd World Martial Arts Tournament Gi (With + Without Turban & Weighted Armor) *(I don't know if the game will add this outfit in, but never hurts to ask.) *, Default Outfit (Turban only), Default Outfit (Weighted Armor only), One Armed, Mind Controlled (World's Strongest Movie or Garlic Jr. Saga), Post Boy Outfit, Namekian Warrior in Black, DB FighterZ - Clone, DBZ Manga Colors, 

Nail: Default w/ Blue Vest

Krillin: 23rd World Martial Arts Tournament Gi, Buu Saga Outfit, Broly: Second Coming Outfit/ Picclo Gi *(With + Without Armor) *, Yo! Goku and his Friends Return! Gi *(Normal Gi w/ Buu Saga hair) *, Battle of Gods Outfit, DB Super Superhero + Super - Police Outfit, TACOS Shirt, Dragon Ball FighterZ - Clone

Yamcha: 23rd World Martial Arts Tournament, Bandit Outfit with Short Hair + Red Bandana, Baseball Outfit (Z + Super), DB Super - White Gi, Xenoverse Villainous Mode/Supervillain, Yamcha (Super Dragon Ball Heroes - Supreme Kai of Time Saga), DB FighterZ - Clone

Tien: Dragon Ball - Crane School Logo + 22nd World Martial Arts Tournament Gi (Purple Pants), 23rd World Martial Arts Tournament - Gi w/ Yellow Shirt, Buu Saga Gi, Dragon Ball FighterZ - Clone

Trunks (Future - Z): History of Trunks - Capsule Corps Long Sleeve + Blue Jacket *(After Gohan's death) *, Jacket w/ Ponytail *(Exited the Hyperbolic Time Chamber with Vegeta) *, Broly: The Legendary Super Saiyan - Sleeveless Jacket, Trunks (Xeno), DB FighterZ - Clone

Super Trunks: Trunks (Future - Super) Outfit 2

Trunks (Future - Super): Dragon Ball Z - Original Hair + Ponytail, Trunks (SDBH - Red Scarf)

Trunks (Kid): Broly: Second Coming Outfit, Super - Casual Clothes, Super/DB Super Broly (Concept) - Overalls, Super - Great Saiyaman Outfit, Super (Manga) - Ranger Outfit

Goten: Super - Battle of Gods Arc Gi, Super (Manga) - Ranger Outfit, Wrath of the Dragon Outfit,

Vegito (Z/Super): Vegito (Xeno - Super Saiyan 4), Vegito (Xeno - Super Saiyan Blue), 

Gogeta(Z/GT/Super): Gogeta (Xeno - Super Saiyan), Gogeta (Xeno - Super Saiyan 3), Gogeta (Xeno - Super Saiyan 4 + Super Saiyan 4 Kaioken), Gogeta (Super) (SDBH - Super Saiyan Blue Evolved), Gogeta (Xeno - Super Saiyan 4 Full Power Limit Breaker)

Gotenks: Gogeta (Z) Colors, Gogeta (GT) Colors, Gogeta (Super) Colors, DB Super Superhero Colors, Xenoverse Villainous Mode/Supervillain,

Videl: Outfit 1 with Outfit 2's hair, Outfit 2 with Outfit 1's hair, Buu Saga and Fusion Reborn - FIGHT Outfit, Great Saiyaman 2/Great Saiyawoman (Helmet + No Helmet), Broly: Second Coming Dress (Hat + No Hat)

Master Roshi + Master Roshi (Max Power): Jackie Chun Outfit without Hair *(Fight against Demon King Piccolo) *, Outfit 4 (Orange Shirt variant), GT Outfits

Frieza (Z) (1st Form): Armorless, Budokai Alt. Colors, DB Super Broly Colors, Kuriza, Lord Chilled

Frieza (Z) (2nd Form, 3rd Form, Final Form and Full Power) + (Super): Cut tail, Budokai Alt. Color, Budokai 2 (Majin for Frieza ((Z) - Final Form) or Frieza (Super)) *, Frieza (Xeno - Dark Dragon Ball) *(Can apply to either (Z) Final Form or (Super)) *, Xenoverse Villainous Mode/Supervillain, Dragon Ball FighterZ - Clone

Golden Frieza: Xenoverse Villainous Mode/Supervillain, Black Frieza

Cell (Imperfect, Semi-Perfect, Perfect Form, Perfect Cell): Budokai Alt. Colors, Budokai 2 *(Majin for Cell (Perfect Form) or Prefect Cell) *, Cell (Xeno - Dark Dragon Ball) *(Can apply to either Cell (Perfect Form) or Perfect Cell) *, Xenoverse Villainous Mode/Supervillain, DB FighterZ - Clone, Cell Max Colors

Super Buu: Super Buu (White Eyes Ver.)

Kid Buu: Kid Buu (Xeno - Dark Dragon Ball), Xenoverse Villainous Mode/Supervillain, Dragon Ball FighterZ - Clone

Hercule Satan: Gi w/ Cape, DB Super Gi w/ optional Super Saiyan wig, Gi/Balding (GT), Black Gi w/ Red Cape, Gi (Xenoverse colors), Gi w/ Tournament Belt, Gi w/ Jetpack

Chiaotzu: Crane School Gi (Green w/ optional Shoulder pads), Crane School Gi (Blue), Dragon Ball Movie 3: Mystical Adventure - Emperor Chaiotzu

Yajirobe: 23rd World Martial Arts Tournament - Masked Man, Android Saga - Scarf, Buu Saga + Dragon Ball GT, DB Super - Goku Black Arc Yajirobe (Future)

Pan (GT): Straw Hat, Bee Outfit, Pan (Xeno)

Bardock: Bardock: Father of Goku - No Bandana, Masked Saiyan/Time Breaker Bardock w/ optional Broken Mask, Bardock (Xeno)/Warrior in Black

Raditz: Budokai Alt. Outfit, Dragon Ball Z: Attack of the Saiyans Colors/Nappa armor, Dragon Ball R&R

Saibamen: Kaiwareman/Blue, Kyukonman/Yellow, Copyman/Black, Tennenman/Pink, Jinkouman/Grey, Red Saibamen *(Doesn't have the same naming convention as the others for some reason.) *, World's Strongest - Bio-Men, 

Nappa: Saiyan Saga Armor (Early Anime Colors), Budokai Alt. Outfit, Bardock: Father of Goku - Hair/Toupee, DB FighterZ - Clone

Zarbon + Super Zarbon: DBZ Anime Accurate Colors, Time Breaker Super Zarbon, Resurrection F Frieza Force Armor/Colors

Dodoria: DBZ Anime Accurate Colors, Time Breaker Dodoria,  Resurrection F Frieza Force Armor/Colors, Xenoverse 2 Model or DBZ Kakarot - Frieza Saga Model *(I prefer this design over the Bardock: Father of Goku Ver.) *

Cui: DBZ Anime Accurate Colors, Time Breaker Cui, Resurrection F Frieza Force Armor/Colors

Captain Ginyu: Goku, Vegeta, Tagoma,  Resurrection F Frieza Force Armor/Colors, Dragon Ball FighterZ - Clone

Recoome: Resurrection F Frieza Force Armor/Colors, Dragon Ball FighterZ - Clone

Burter: Resurrection F Frieza Force Armor/Colors, Dragon Ball FighterZ - Clone

Jiece: Resurrection F Frieza Force Armor/Colors, Dragon Ball FighterZ - Clone

Guldo: Resurrection F Frieza Force Armor/Colors, Dragon Ball FighterZ - Clone

King Cold: DBZ Colors, Resurrection F Frieza Force Armor/Colors, 

Android 16: Battle-Damaged, Capsule Corps Logo, Budokai Alt. Colors

Android 17 (Z/Super): Default (No Gun), Buu Saga Jacket, DBGT Jacket, Budokai Alt. Outfit

Android 18: Super - Casual Clothes, Dragon Ball Z - Cowgirl Clothes, DB Super Superhero Tracksuit

Dabura: Default (No Majin Logo), SDBH - Dabura (Xeno), SDBH - Dabura (Xeno - Demon God Dabura)

Broly (Z - Legendary Super Saiyan): Xenoverse Villainous Mode/Supervillain, Bio Broly, Raging Blast - Broly (Super Saiyan 3), SDBH - Broly (Super Saiyan 4), SDBH - Dark Broly

Broly (Super): Default w/ Shock Collar, DB Super Superhero Outfit (Long Sleeve)

Turles: Tree of Might Anime Accurate Colors, Tree of Might Cloak (*Early in the movie), Turles (Xeno - Dark Dragon Ball), SDBH - Turles (Brown Cloak), SDBH - Evil Saiyan Turles, Xenoverse Villainous Mode/Supervillain

Lord Slug (Normal): Default (No Helmet and Sleeveless), Lord Slug (Xeno - Dark Dragon Ball) *(Don't know if it's possible to apply this for Giant Form) *, Xenoverse Villainous Mode/Supervillain

Cooler + Cooler (Final Form): Golden Cooler

Metal Cooler: Metal Cooler Core, Xenoverse Villainous Mode/Supervillain, SDBH - Metal Cooler, SDBH - Golden Metal Cooler

Android 13: Default (No Trucker Hat)

Bojack (Normal + Full Power): Bojack (Xeno)

Super Janemba: Fusion Reborn Anime Accurate Colors, Super Janemba (Xeno - Dark Dragon Ball), Super Janemba (Xeno - Modified Janemba), Super Janemba (Xeno - Evil Demon Janemba), Xenoverse Villainous Mode/Supervillain

Hirudegarn: Pre-metamorphosis, Baby Hirudegarn (Dragon Ball Fusions)

Super Baby 2:  Adult Baby *(Weaken by Goku (SS4) after cutting off Great Ape/Oozaru Baby's tail.)*

Syn/Omega Shenron: Syn/Omega Shenron (Xeno), Majin Omega Shenron, Xenoverse Villainous Mode/Supervillain

Goku Black + Goku Black - Super Saiyan Rose: Supreme Kai Outfit, Crimson Masked Saiyan w/ optional Broken Mask, Xenoverse Ultra Supervillain

Zamasu (Fused): Zamasu (Fused - Revived)

Caulifla: Caulifla (Oren Posessed)

Kale: Kale (Kamin Posessed)

Jiren (Full Power): Xenoverse Ultra Supervillain

DLC:

DLC Pack 1: Heroes of Justice

Gohan (DBS Super Hero): Gohan (Adult) - Default Outfit 4, Gohan (Adult) - Default Outfit 5, DBZ Anime Accurate colors, Great Saiyaman *(Mostly to satiate my curiosity of the idea of Beast Great Saiyaman.)*, 

Piccolo (DBS Super Hero): DBZ Anime Accurate colors, Default w/ Turban & Weighted Armor *(Not sure how it would look, but very curious overall)*, 

Gamma 1 + Gamma 2: Red Ribbon Army Soldier (Tan), Red Ribbon Army Soldier (Navy Blue Trenchcoat), General Blue colors, Android 8/Hacchan colors, Android 13-21 colors,

Cell Max: Imperfect Cell colors, Semi-Perfect Cell colors, Cell (Perfect Form)/Perfect Cell colors, Cell Jr. colors, Cell X (Dragon Ball Online), Cell X (Xeno - Dark Dragon Ball)