A bat

You took a card and saw a bat, nothing too insane, just means you can keep your black clothing on. You somehow trip on something and fall into the changing room, landing on the floor you find yourself struggling to get up, your hair grows so much it would reach down to your butt if you were stood up. Your clothes turn into ash, leaving nothing but your underwear and shoes. Your boxer briefs split into 2 as half makes its way onto your chest, covering your nipples as they begin to grow into ample C-cup breasts. The other half transforms into some kind of bondage panties, causing your penis to shrink inside you leaving nothing but a flat smooth surface. Your boots gain heels as your socks crawl up your legs, turning more transparent into a pair of thigh highs. This wasn't quite the look you were going for, but you're not complaining!