Hmm… Well, I don’t think there is a tutorial about this thing… but I suggest you to take a look at a few games.
I would personally, if I were to start such a project, first begin with a lobby, first begin with inspiration.
For it, I suggest you to take a look at a few games / homestores of those two groups,
Solence clothing and Formalitiat.
After having a general idea of how to create a lobby for your experience. ( if you are ever going to create one )
Start by looking through other users’ creations in Avatar Outfit Creator and Catalog Avatar Creator. I believe that looking through those will be suitable mostly.
Okay, so… after preparing yourself. You have to decide on a lobby or a building.
This building should, in my opinion, be split into several categories.
If those categories were split according to the colours of the matching outfits, it would be best, I assume.
Or split the building into different sectors ( like in Tactical outfits ideas game, you can add teleporter pads to other places for more area or something similar to that. )
Also, I don’t think I have actually understood your question so… excuse me if I am trying to help you with something else, other than the thing you are trying to get help at.
Lets just resume, after being done with the obby, you should get yourself a proper model for selling and trying outfits. I believe that it would be best if those models weren’t toolbox models… well… it’s up to you to be exact.
Please reply to this with your actual question so I can tell you my opinion, as I have said before, I don’t really know what you meant in your question.