She shows you what it’s like

“You know, I could show you”, Katie suggests

“What?” You ask

“How great it is to wear oversized hoodie. I have that power now”

“Sure”, you dismiss, focusing on the TV. All of a sudden something weird happens. Your shirt becomes a size bigger. Then it happens again. The sleeves of your shirt begin to lengthen and the material thickens. You continue to browse unaware as a thin layer of soft hoodie fuzz grows inside your shirt. Fabric begins to bunch behind your neck as the hood grows, and the drawstrings fall to your chest. You only notice what’s happening when one of the sleeves covers your hand as you flip through different shows. “What the?” You exclaim, jumping up from the couch. You look in a nearby wall mirror. You were wearing one of your own hoodies, it was just... big. The sleeves swallowed your hands, and the sweater went halfway down your thighs.

“Do you like it?” Katie asks innocently

“Y-yeah, it’s... comfy” you say in shock as you plop down on the couch.

“Okay, lemme do a couple more things. Don’t freak out”

“Oh... okay”, you say, a little excited. You feel a tickle on your feet and feel socks growing. You lift up your pant legs and see that you’re wearing her fuzzy socks. Initially you think it’s a little girly, but they’re comfortable. Then, your pants start to change. They begin to get shorter and shorter as the material becomes a thin cotton. As they reach your thighs they become a pale shade of pink, just like Katie’s. You see your boxers peek out from underneath them briefly before they disappear under the shorts. You feel the seem climb up your leg until it reaches your crotch. The fabric becomes a soft thin cotton that hugs your waist. You look down and see that you are now wearing the same outfit as Katie, albeit bigger. For some reason you are surprisingly fine with this realization.

“Now we’re twinsies!”, She exclaims, “you're even wearing my yellow striped panties.” She begins to rub the front of your soft cotton shorts as you continues to browse.