Looking around, he saw a bag on the bed. He waddled over to the bed and bent down, his arms squeezing his breasts together, and unzipped the bag. Inside it was the biggest pair of blue jeans he had ever seen. He held them up and thought they looked ridiculously wide, but then noticed that he was only holding them as wide as his behind currently was. Also in the bag was a huge black T-shirt, a bra reminiscent of a double parachute, a pair of cotton panties, also enormous, and a pair of women's tennis shoes.
He put the underwear on, almost losing his balance as he lifted each leg. He had to spread his legs wide as he stood to get the underwear past his thighs, after which he reached around and was just able to grab them and pull them over his behind before fitting his belly in the front. The jeans went on next, with some difficulty. They fit perfectly, but getting that much flesh into them wasn't easy. He buttoned and zipped them in front, just able to do so around his stomach, and then waddled to the mirror again. The jeans fit snugly but comfortably, and he looked like a giant balloon from the waist down.
Picking up the bra next, he fumbled with it for a minute, trying to figure out what went where, and finally slipped it on his arms, lifting each heavy breast one at a time into the cups. He struggled to reach the clasps in back but couldn't do so with such huge arms and being so big around, so he removed it and hooked all six clasps first before squeezing into it. Finally getting things in place he realized why women wore these things; the heavy pull he had been feeling in front was relieved as the wide straps on his shoulders bore some of the weight. He pulled the T-shirt on and looked in the mirror again.
The outfit showed off every bit of his size. He was round as a ball, breasts even rounder now with some help from the bra. He grabbed his stomach and tried to squeeze it back in, make it smaller, but the fat bulged around his fingers and bounced back out with a wiggle. He pushed his breasts in, trying to make them go away, but they fell back down, real as ever. He pushed his hips and ass in, not believing all this was really him, and it all sprung back out with a soft bounce.