Sequel idea... make clothing abilities socket-based

I'm typically not a big fan of socketed equipment from a gameplay perspective, depending on how they do it. It often leads to tons grinding or to players being unwilling to socket items because 'they have to find the perfect item to put the gem in and don't wanna waste it.' Though, there are less strict systems.
But, if you can just upgrade any equipment piece to have any ability, why have different equipment at all? Just have some belt or generic trinket that you power up and then costumes and a weapon style.

That being said, I'm a fond of the idea of being able to create layered armor/transmogrify armor or however they want to describe it. If I find cool pirate hat, then I can have the character look like they are wearing cool pirate hat.

Essentially, I wouldn't want the value of finding new, powerful equipment that works differently from other equipment removed from the game. It's one of the reasons I play games like Bloodstained or the Castlevania series. Making every piece of equipment basically end up as the same thing would diminish that. Part of the mechanics and balance are in the idea that you have to choose if you wanted a helmet that gives you unlimited ammo or one that increases or luck stat substantially. But! Having more or a more fleshed out costume mechanic would be a nice addition, and allow the option for those who want to run around looking like a pirate or ninja without having to worry about suddenly having to wear a Wal-Mart Fedora.

I did actually like the idea of the card system from CotM, strangely.
Or the badge system of Hollow Knight.

If it was done more in those manners, I think it could be an interesting add. But, honestly, I think the OPs original needs would be met if you could just set her cosmetics, regardless of equipment. This would also keep from adding another layer of balancing and complication.