Today I got confronted with 2 costume sets that use the same bag icon for at least two of the items and also have the same model, yet different colors and very different rarity. If there's more of these, maybe I should put a page up, but so far is the only one I see where it actually matters (given the difference in availability and thus market value).
Here are the "bag icon" views:
And here are the sets on mannequin:
As you can see the pants differ slightly in length on the right leg, minor difference in detail of the thread patterns in various places as well, but it's basically the same model with different colors.
So watch out and don't accidentally buy the wrong one!