One of the "maxims" of the game setting is "style over substance" so I say no to the idea of a transmog. (It took me a bit to come around to this btw, my original thought was "gimme transmog aaarrrrrrggghhh".) The exception to this is dyes, which I think should just be a mod that goes in a mod slot - got 1 slot, do you want to have that in black or do you want that combat mod? Style or Substance choom?
What the game needs IMO is less randomisation in stores and more stores (like the Mox one selling their merch to you). Having more stores with a more limited randomisation would let you actually get the style you want rather than being stuck in RNG hell. Pushing RNG in stores encourages breaking immersion as it is better to reload them until you get what you are looking for from the store.
Stores also desperately need a "preview" function for clothes - the more common items are easy to predict what they will look like, but sometimes you need to see what it will look like with certain other items or there is some strange item that you need to see (or the many dresses with basically the same icon but variations in their looks).
Let me save outfits, boom. Problem solved. Max 20. Im a flashy dude
So very much this as well. I'd love to have 3 pre-set outfits that are easy to swap, for me it would be adventure, social, casual.