BE CAREFUL when buying large amounts of clothing!
If you fill up any category of your wardrobe (and there IS a hard limit to the number of items you can have in a category), that category will become completely unusable. You can't change or delete anything in it and must revert to an earlier save. It's a bug with no workaround that i know of at the moment.
Make a backup save and test each category in your wardrobe after you shop. I believe you get a warning that your wardrobe is full when you try to buy too many items, but by then it's too late.