AITAH for telling my sister (12f) that she can't wear my (18f) shoes?

For a bit of context, my family, specially my mom, my sisters, and me, have issues with accidentally wearing each others clothes. It's not that big a deal, of course, but recently, my little sister has started to just... wear my clothes without asking. On purpose. She knows they're mine, and sometimes she even wears clothes that I had planned to wear that day. This week, my school is doing a spirit week, since we have a dance this weekend. Today's theme was "Red Out" (it's stupid, I know, my student government has the dumbest ideas) and I planned on wearing a pair of red Vans that I'd gotten as a gift a few years ago. Only, I came downstairs, and guess who was putting on my shoes? We were running late, and I didn't have time to find a different pair of shoes to wear, so I told her to take them off and find something else to wear. Now she's pissed at me and probably will be the whole day. I kind of feel guilty because she'd already had them on and I made her take them off, but at the same time, I'm tired of her taking whatever she wants from me and wearing my stuff. AITAH for doing this?