Slightly off topic and definitely unhelpful but me and my friends are always commenting that onsies should go up to our size!
My DH said the same thing, then one day this package turns up on our doorstep from the USA - he had gone and ordered 2 giant man sized onesies (one for his brother as a joke) called 'footies' to wear to bed. Suffice it to say he got some serious threats if he ever wears 'it' in front of guests! Then he had the hide to complain that they rubbed the inside of his foot and he didn't want to wear them.