You look at the costume in your hand. It was a pregnant belly, probably 9 months. It came with a nursing bra and panties. The main part of the costume is a mold of the belly and breasts of an average 9 month pregnant woman. Strangely, the skin color matched yours perfectly. Just from the texture and detail, you can tell it's a high quality costume.
"Why not?" You think. "I'm not going to the party wearing it but I've always wondered what being pregnant feels like. Not like this will actually simulate that but I'll give it a whirl."
You duck into a changing room and admire the costume before putting it on. The detail was incredible! Every texture was perfectly accurate, the skin feeling exactly like real human skin. There were even fake milk stains down the front. The mold extended from breasts to pussy and the pussy was just as accurate and detailed as the rest. The whole thing was quite heavy as well.
"Probably to simulate pregnancy even more accurately." You think.
Reaching into the belly, you remove a flap and can see a plastic baby fetus in jell-o like goop. You close the flap quickly so as not to damage anything. After all, you know you won't be buying this costume. No way are you wearing that to the party! You open two flaps in the breasts and two big plastic bags of real milk flop out onto the ground with a SPLAT. Wondering how on earth they didn't break, you stuff them back and close the flaps. Finally, after several minutes of inspection, you decide to put on the costume.
"Ok, let's see..." You think as you pull one more thing out of the bag of costume pieces. "Some sort of gel? Oh, it's an adhesive to keep the belly on. Must be strong if it plans to keep that mammoth on me. 'Comes off in water'. Perfect! I'll be able to remove it."
You spread the gel onto the inside of costume, then press it against yourself. It felt so incredibly realistic! In a way it was uncomfortable because how heavy it was and how tightly it clasps your body but you are too busy marveling at its realism to care. You put on the bra and panties.
"Whoa!" You think. "I look just like a mommy! People might event mistake me for a real pregnant woman if I go out like this."
Suddenly, you feel a warmth in your tummy and a tingling in your chest. You could hardly feel the gel anymore. It must've hardened. Then, a sharp pain in your groin and the costume became much more comfortable, seeming to fit better wherever a strange sensation was, whether it was tingling, warmth or quick bursts of pain. You feel weird, tired and slightly nauseous. You sit down on the changing room stool as the sensations faded. You shake your head. Then, a sudden wetness gets your attention. Taking off the bra, you see that the nipples were leaking warm milk.
"The bags must have leaked." You think and try to take off the costume in order to adjust them.
No matter how hard you look and feel, the edge of the mold seems to have disappeared. In dismay, you are about to put on your clothes and ask an employee for help when a tiny kick makes you jump...a kick from inside.
"Oh no. Oh no no no..." You say to yourself as the kicks continued.
This costume was getting a little too real. You tentatively place your hands on your bulging stomach. You could feel it. You squeeze your breast and pleasure runs up and down your spine as a jet of milk soils your clothes. No way around it. It looks like this is your party costume after all.