Business suit. But not just a business suit, a woman's business suit. You try to put the suit back on the hanger, but find that it is impossible, so you walk into a changing room to try and do it in privacy, afraid that someone you know might walk in and see you fiddling with woman's clothing.
As you reach the changing rooms, you notice that the ceiling seems to be getting farther away. It stops after a moment or two and you dismiss it as your imagination. You sit down on the bench to fit the costume back onto the hanger. Then you notice the first of the changes. Your hands are suddenly small and delicate looking, with absolutely no hair on them at all. and your nails have some red polish on them. You hastily roll up your sleeves, alarmed, see that the same thing has happened to your arms.
You then realize what the woman meant when she said that every costume was guarunteed to fit. She meant that you would fit the costumes, because your body would change to do so. You hastily take off your clothes in case they would be ripped when you changed. your body and legs had already become slenderer and hairless, your skin taking on a smooth, delicate, almost glistening appearance. as you watch, you see two round, smooth mounds of flesh rising from your chest and enlarged aureolas. Your newly attained cleavage stops it's growth at about a C-cup. As you are absorbed in your breasts, you feel a sucking as your dick and balls are sucked into your crotch, replaced by a vagina, clitoris, and urethra. You reach down, afraid of what you might find, and confirm your fears. You then feel a wrenching twist as your insides shift from testes to ovarian tubes and a uterus.
Still sitting down, you look past your breasts at your vagina and, beyond that, your toes, which have the same red nail polish as your fingernails. You sit back against the wall, despairing, when you happen to look at the mirror across the room, and see that your face has morphed to become female, for lack of a better way to describe it. As you take a look at your new fully nude body, you see that the businesswoman you are looking at (yourself) is about 25 years old. You were correct in guessing the size of your breasts (C-cups).
You realize that you should probably find a way back to your own body, so you decide to ask the storekeeper how. Then you realize you're completely nude and can't possibly go into the store looking like that. It would be indecent. So you take a look at the suit and see it consists of a button-up white blouse, a black jacket, and a black skirt. Wondering where the panties are, you turn the jacket inside out and see a vacuum sealed bag containing black frilly silk panties and a matching bra and pantyhose. However, on the outside of the bag a notice says: Warning! Opening this bag indicates a willingness to buy this costume! Attempts to steal or refusal to pay can result in permanent entrapment in an undesirable form!
You sigh, not seeing much choice, and check the price tag. You see you can easily afford it, and assuming all other costumes are similarly priced, at least ten more. You open the bag and put on the panties, making a note of the smooth feeling it has on your new folds of skin. You then put on the bra, also making a note of the way it felt when the silk rubbed against your flesh. You pull up the pantyhose and put on the blouse, buttoning it up to conceal your bra. You put on the jacket and button that up as well. You then put on the skirt, liking the way it accents your body. You stand strike a sexy pose, thrusting your hip out to one side. You then see a pair of high heels on the hanger and put them on. You throw your hip out to the other side, the heels completing the effect. You notice you now have mascara and lipstick on, and are wearing silver studs in your ears. You walk out the door to find the woman, taking your clothes and the hangar with.