Wear for all occasions

"I wish that a zipper would appear upon the backs of everyone. Upon 'unzipping' someone that person would become a latex costume sized to fit whoever had unzipped the person. Whenever someone is wearing someone else the costume will change that person's body to look like the person who had been unzipped. Whenever a person is taken off they will return to their normal shape as will the person who had removed the 'unzipped' person" Jon said, finishing the long winded wish as he felt something appear on his back.
"Karyn, mind if I try it?" Jon asked as Karyn looked at him and laughed, showing her back to him. No sooner had he begun to move the zipper than Karyn suddenly seemed to go limp in his hands. Finishing unzipping Karyn he slowly placed his feet into the latex costume, letting the feel of it course down his legs as he stretched it tight. Next he slipped his arms in slowly, letting the feel of the latex course through his arms and hands as well. Getting to the head he noticed it now seemed hollow through the neck, so slipping it on like a mask he adjusted the face and torso to match his. Looking into the mirror it looked as if nothing more than a costume, his eyes blinking through the empty spaces in the mask. Looking to the deflated cups and the clothing that had fallen all over the floor he began to zip up the back. No sooner had he finished doing so than he felt as if he was shrinking and his stomach began to sink inwards as parts of it began to move up, filling the cups of the costume. He could feel as his waist, hips, and butt began to change, giving him the female equivalent to all of them. Jon felt a rush as his member and balls began to recede and his legs began to grow slender and smooth, the costume slowly turning into his skin. He watched in the mirror as his face began to merge with the face of the costume, quickly giving him a more feminine look to his face. The transformation had taken no more than a few minutes from when he had completed zipping into the Karyn costume as he now stared at her naked body in the mirror.
"I wish an unzipped person was still able to use their senses and was able to talk to the one who had unzipped them telepathically when they are being worn." Said Jon in Karyn's voice as suddenly he heard her in his head.
"Jon, this is weird, kinda fun though, should make things interesting."
"Yeah, feels like this is my body instead of a costume, its kinda wild actually." Jon said looking at Karyn's clothes on the floor.
"You think Sarah works like that now?" Karyn said giggling.
"I can take you off, want me to find out?"