You've gotten a lot of good input. Mimi had a bunch of good questions at the beginning of her post. Our son is 12 and has always been keenly aware of textures. I can't say he has sensory issues, but he most certainly has preferences.
For our son, he loves the soft feel of a lot of the satiny labels. It harkens back to his favorite teddy bear who has a satin ribbon around his neck. To this day, his labels are his comfort zone. Even at 12, I still see him with his hand at the back of his neck, rubbing his satiny label on occasion. Go figure!
Any guess if it's the texture of things your daughter is rejecting? New stuff (shoes/clothes) can be stiffer and not as inviting as the old favorites. It depends on the kid.
Does she have enough communication skills to tell you what she likes? Part of it is probably just a phase and frustration of her not being able to fully communicate what she wants to say or get or not get. But you can ask a bunch of yes or no questions that might help both of you sort out what drives her buggy about new stuff.
You can start with simple questions and then progress to a game, making the questions more and more outrageous and silly as you go. Too soft? Too stiff? Smells too new...? Too green? Too blue? Too pink...? Too monkeyish? Too elephantish? Too alligatorish...you get the picture. Sometimes a little humor goes a long way with kids (and moms) who are frustrated. And sometimes the goofy helps trip the mind of what the problem really is.
I swear by consignment shops for kid's clothes. They start out softer, because they're used, and you spend a ton less cash for them. Also, if it's a bust on the "like scale", you're not out so much money and can just return it or sell it again. Like Mimi, I've now gotten to the point where I have a pretty good sense of what he likes and doesn't like--texture-wise, that is. Soon enough, he's going to start caring about style. YIKES! Is he really going to be a teenager next year?!
Good luck!