SpiritHoods onesies are cut in a slim fit and made with a soft and stretchy velvet material. Our onesies feature side snap buttons to help adjust for a baggier or snugger fit around the waist.For the most accurate sizing information please see model measurements in the product description and also check out the Size Guide found on the product page of the item you’re after. If you have any additional sizing questions, please email help@spirithoods.com