You laugh, "Guaranteed to fit? Yeah right!" You stick your pinky finger into the doll shirt's sleeve,and suddenly find your whole arm sliding inside the fabric. You're falling. The box lands with a thud. You're lying across the skid mark in your dirty boxer shorts inside the shiny black box. You crawl through your leg hole and find the rest of the clothing which you put on. It does fit perfectly. You laugh and climb back up your shorts to the top of the box where a leg is hanging over the edge. You drop down to the ground, and roll on the carpet.
Everything is so big. You figure you'll grow back to normal size when you take these "magic" clothes off, but for now you want to explore your new giant world.