Okay, that was inconvenient, but you realize you may have found a loophole. The curse can make you sprout wings or something when you try to put on a shirt, and who knows it could make you sprout a tail or something if you tried to wear pants.
But there's a way around this.
You could wrap the remains of the shirt around your waist like a makeshift loincloth. Then even if you sprouted a tail as long as you were able to tie it in place you could work around them or something. It might not cover your butt, but at least you private parts on the front would be covered.
Quickly picking up a few pieces of the scrap you tie them together into a makeshift loincloth happy that you've beaten the curse.
Naturally your body releases a glow once more.
"Ah! There's nothing you can do I can't just counter!" You probably a little foolishly taunt the curse. So it comes as a bit of a surprise when suddenly the former shirt/loin cloth, the mirror, and in fact everything else in the entire store suddenly starts growing larger. Your "clothes" fall to the floor, and you slowly sink toward them. Getting smaller in height and width. In just a matter of seconds, you've been reduced to being a single inch tall, and you definitely can't wear any part of that shirt now.
On the bright side? You still have wings, so at least you'll still be able to get around somewhat faster than walking.
Of course you're still a naked little one inch tall angel child. That could be problematic.