In the changing room, the two of you begin to sort through the pieces of the costume.
There are two large, separate sections that each consist of two leg-holes capped by wedge-shaped rubber hooves. Your piece has a rather long waist section that would probably come up to your armpits, while the section Jess is holding has a shorter waistband with a large opening in the back, probably for the person in the rear to bend and "attach" through, making them look like one animal with four legs.
"It's definitely a centaur costume," Jess concludes, inspecting the hanger and extras-bag for additional parts. "I don't see any upper body clothes or a mane or horse-head anywhere."
"Well I'm not quite sure how the logistics work, but I guess if I wear the back section, I can just wrap my arms around your waist with my head against your back." You rub the back of your neck, already anticipating some discomfort. "I mean, it'll only be for when we arrive and when people wanna take photos and stuff, right?"
Jess nods, distracted with putting the unicorn headband on so that the horn looks like it's protruding from her forehead. "Of course. Just for pictures." she murmurs, fluffing her hair to better hide the clear, plastic band.
"Alright, well, here goes." You shuck your pants and shirt, sliding your first leg into the suit until it reaches the bottom. You're surprised to feel some sort of high-heel, your weight coming to rest on the balls of your feet. Sighing and rolling your eyes where Jess can't see, you resign yourself to the fact that you're going to be wearing heels tonight for the first time in your life. Surprisingly they seem to be about the right size, and as you slide your other leg in and come to stand on both costume "hooves" you're astonished at how comfortable they actually are.
"Wow, you're tall!" Jess exclaims, having caught a glimpse of you behind her in the mirror. She turns and examines your feet. "Ohh, they're like platform wedges! Neat! Don't worry, babe, wedges are the most comfortable heels."
You take a couple of tentative steps around the spacious dressing room "Yeah, I'm shocked at how easy it actually is to move in them!" you say, noticing the faint "clopping" sound they make as your walk. "Okay, your turn - lets see how your part fits and how we fit together." You take a seat on the bench to the side and watch as Jessica hastily strips down to her matching underwear.
"I'm not sure what sort of shirt, or... bustier or whatever I should wear." she says, slipping into the front-legs with ease. "Maybe something woodland-esque? I could pick up a brown bra..." The hooves seem to fit her smaller feet just as well as they fit yours, despite them looking to be the same size. You shrug it off as an optical illusion as Jess pulls the furred fabric over her hips. You can see her pink panties through the loose hole in the back of her costume portion.
You catch her eye and wink. "I guess being pressed up against you down there won't be TOO much of a hardship." Standing, you pull the waistband of your section up to your armpits, where some sort of elastic keeps it snuggly in place. Jess is facing the mirror, already looking like a half-horse centaur-woman from the front. You step up behind her and turn her face for an over-the-shoulder kiss. "Here goes nothing." you say, bending at the waist and starting to work your arms into the hole behind her hips.