I am propably reaching but mutants being left to wear their costumes in the X-men movies could imo be linked to how queerness was seen and treated through the years.
In the first couple movies you got these dark leather "biker gear" looking outfits, basicly saying "sure you can exist, but keep it lowkey, don't express yourself too freely and openly".
Then comes first class and the team gets more color but it's the same outfit for all of them exept for small changes to fit the wearers needs. Kinda a "you can exist, be open but don't make it too complicated to not overwhelm us."
By Apocalypse we see them get more comic accurate suits, with personal touches and unique designs, they're able to be freely themselves and express who they are.
In Dark Phoenix we see a step backwards into the utilitarian muted looks, like queer people had to step back over rising controversies and pushbacks.
Now with Wolverine in 2023 i'd call this the "fuck you, we are here and we WILL show ourselves and be true to ourselves even if it makes you angry and uncomfortable" with accurate suits, bright colors (some might even say too bright) and a fair amount of camp. Whitch works perfectly i think for the current times where queer people are starting to loose rights and the amount of hate (especialy for a specifc part of the comunity) being on the rise.
Again i am propably and most likely reaching, but it makes sense in my head.
