Seems like a very archaic sign. Have you seen the type of pants that are popular these days? Boys wear skinnier pants than the girls wear! I'm a millennial that grew up with baggy and sagging pants.
It's a great sign and a nice try. The only problem is, the people that purposely dress that way probably CAN'T READ.
The other problem with that sign is that society has accepted that men can identify as women, so what's to stop an adult man from identifying as a 3 year old boy? Clownworld gets better and better everyday doesn't it?