You decide to try on the Chicago Cubs jersey - white with blue stripes - and Chad gets it down from the top row on the wall of jerseys. As he takes it off the hanger and throws it onto your shoulder, you notice the back has the number 50 without a name. "Don't these usually have a player name on the back?" you ask inquisitively, with Chad responding, "it will soon. Now go into the changing room and I'll bring you the matching pants, cleats and hat in a few minutes!"
Puzzled, you go into the changing room and strip down, taking your time before slipping up the sliding shorts when you realize how good the tightness feels. Once you feel it over your rod and balls, you moan out deep in pleasure as the smoothness feels nice and cool. That just encourages you even more to slip on the compression shirt, the sensation just as good, making you throb even more.
You go to grab the jersey, already unbuttoned and slip your arms into the sleeves. As the front of the jersey surrounds your torso, the Cubs logo huge on your left chest, you start to button it only to begin feeling your body get incredibly warm. Suddenly it feels like your arms are growing within the jersey, as your biceps and triceps begin to fill out the sleeves and your forearms bulk just as much. Your chest begins expanding outward as well, pushing your now bulging pecs into the logo on your chest and making the jersey nice and tight. Your back isn't ignored, as your lats start to thicken while your shoulders start to carve themselves nice and firm.
You turn your body to see it in the mirror, noticing your hands bulking up in size and strength; your palms getting rougher. In the mirror you see the back of your jersey - where there wasn't a name now has one - yours - and you can't resist flexing as it feels like your body is being built to show off it's muscle inside the Cubs jersey.
Chad knocks on the door startling you out of a daze, "I have the rest of your gear, you ready?"