Bette Midler and Shelly Long in the movie Outrageous Fortune. When they are trying to track down the two-timing guy they have both been seeing, they locate him at a brothel. The stranger they have just met(George Carlin) warns them they won't get passed the madame because it is customers only. Their solution is to take his clothes and disguise themselves as young boys... leaving him in their clothes.

I remember one who is not a woman but a girl. Mary Ann Jackson from the 1920s and 30s Little Rascals. In the short "Boxing Gloves" some neighborhood boys promote a big fight between rivals Chubby and Joe. Women were not allowed admittance to boxing events during that time. Mary Ann was turned away with the explanation that dames faint at the sight of blood. First she makes a failed attempt to sneak in wearing a man's coat, hat and a fake mustache. She then pops up ringside behind Jackie. After quickly sizing him up, she pulls him from his seat and out of view. Moments later she takes his place ringside now wearing his clothes and hat.