Micky and Minnie Mouse are two of the most popular cartoon characters ever created, loved by both children and adults. If you like Minnie, you should be able to find plenty of clothing featuring her image, and that includes onesies. Some models even feature hoods that have the iconic mouse ears attached to them. Some may have a large image of Minnie on the front, while others have a smaller, repeated pattern.
I like the look of both of these:
Adult Minnie Mouse onesies pictured:
Left: Disney Women’s Minnie Mouse Hooded One Piece Pajama
Right: Disney Women’s Minnie Mouse Microfleece Jumpsuit