Using the same method as Dice's "Playable Stone Knight and Lucas Grey" mod, I have replaced suits with non-unlockable ones. I have included Knight, Stone and Grey in this mod, so you do not have to pick between my mod or his, they're all in one place.

Replacements

I have replaced suits that do not require ET unlocks (With the exception of gloveless Suburban Suit, you need Gloved Suburban Suit for that one)
Since Siberia is in the Expansion Pass, you need to own the Expansion Pass in order to get the Siberia Suits
As for the rest, you will need to own both Season 1 and H2 to get them. And one suit requires you to have an IOI account.

Signature Suit = Jack O' Lantern Suit(Default)
Signature Suit w/ Gloves = Sniper Assassin Suit w/ Gloves (Apparently there's a slight difference?)
Snow Festival = Prologue Suit (Complete Hokkaido Snow Festival challenges)
Cashmerian = Tactical Gear (Colorado) w/ no hat(Complete the Mumbai Escalation - Dubious Cohabitation)
Futo Suit = Ninja Suit(IOI account suit)
Arkian Tuxedo = Exterminator Suit(Complete Blake's Endeavour, Sgail Challenge Pack)
Raven Suit = Lucas Grey(Own S1 GOTY)
The Tropical Suit = Siberia 47(Level 20 Mastery Haven Island)
Smart Casual = Siberia Knight(Own Expansion Pass)
Winter Sports = Siberia Stone(Own Expansion Pass)
Requiem = Knight(Own Legacy Pack)
Tactical Wetsuit = Stone(Play Hawke's Bay Escalation)
Suburban Suit w/ Driving Gloves = Without gloves(Complete Whittleton Creek ET)
[Redacted] = [Redacted](Location-specific suit)
[Redacted] = [Redacted](Location-specific suit)
[Redacted] = [Redacted](Location-specific suit)
[Redacted] = [Redacted](Location-specific suit)
[Redacted] = [Redacted](Location-specific suit)
[Redacted] = [Redacted](Location-specific suit)
[Redacted] = [Redacted](Location-specific suit)
[Redacted] = [Redacted](Location-specific suit)

My thinking is when you're replacing 12 suits no one will be happy with all my choices, so all I could do is make sure new players can use this mod by not having ET requirements. And since this is offline mode only, you do not need to uninstall this mod if you want to play with a suit that I've replaced, just go online.

That means the only people who will be disappointed are people who happen to want to play an offline modded mission using a specific suit I've replaced, in which case just uninstall this mod.

Suit functionality

Some suits are incapable of being frisked. This means guards will turn you away completely, even though you're actually allowed inside the area. A lot of these suits may have dodgy trespassing zones (Similar to "The Buccaneer")

Super Secret Cut Content

I've replaced some location-specific suits (Default suits of specific locations) with disguises that were cut from the game. These will only work at that one location. I won't spoil what they are, go through the maps and try find them all ;)

Special Thanks

This mod would not have been possible without the method Dice discovered. I did however spend way too friggin' long going through the entire game's database and manually testing suits one by one to see if they show up in all maps. If a suit was not included (Such as Swimwear 47) then rest assured it does not work in any other maps. Sad, I know.