Also available for the whole family! way more fun to put on than sweats, and cozier than regular ol’ pyjamas, our waffle-knit holiday party onesie is a playful piece for keeping warm this winter. Whether you're lounging around the house, cottaging with friends, or bundling up for bed, this onesie will keep you toasty all season long. julia is 4'1" and wears a 4-5y. onesie measurements: 2-3 y: body length: 35" chest width: 12.25" 4-5 y: body length: 39" chest width: 13.25" 6-7 y: body length: 46" chest width: 14.25" 8-10 y: body length: 53" chest width: 15.75" 55% cotton. 42% polyester. 3% spandex.