Load the mod in SSEEdit and enable the weight sliders for the male and female body under the Armor Addon for the Cuirass from Unknown to Enabled (uncheck Unknown and ONLY check Enabled to re-enable the weight sliders for the armor.) and any other section that needs it of the plugin and it should fix the skinny arms problem.
I also found that the weight sliders were/are Enabled for every other armor piece, just not the Cuirass which would likely increase the arm size when the weight sliders are actually re-enabled. So just check the entire mod, not under the temper recipes but the Addon section and simply re-enable all sliders that are under the term Unknown. Remember to NOT leave both boxes check marked as this won't fix the problem.
Doing this won't solve the skinny arms problem. The issue is it lacks a mesh for the large body. It has only the mesh for the lowest weight slider setting (the _0.nif file). It needs a _1.nif file as well for the "buff" weight). This is true for all the pieces, and this armor completely lacks meshes for the "buff" weight (whether that's intentional on the part of the original author or not, I don't know).
It's the reason I otherwise completely ignore this armor (sadly, as it is otherwise beautiful work).
For anyone with the skinny arms problem thinking of trying this- don't bother. As Zeshin said, this won't solve it. Since the armor lacks a mesh for any of the other weight options, doing this won't just not work, it'll make the armor invisible on your characters body entirely (since, as Zeshin stated, there does not exist any meshes for the other weights).
Probably a longshot as this was posted years ago, but is there any chance of a port for your old glass mage armor from oldrim? Or is it something I could in theory do on my end with the creation kit? (Not to post, I just really want to use it on my new battlemage)
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-Natterforme
It's the reason I otherwise completely ignore this armor (sadly, as it is otherwise beautiful work).
https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd.it%2Fdoes-anyone-know-where-to-download-this-armored-robe-mod-v0-m8baaqf3hdy91.jpg%3Fauto%3Dwebp%26s%3Dab87db7729bdc14f9047cb387407f9a2c19beb8f