Make them wear pink.
Just don’t put a pair of undies on their heads!
When I got hired on at a different department at work I walked into the then all male office and was surprised to find it painted pink. Apparently some of the guys balked at having a woman come aboard and cramp their style so the manager ordered the walls painted a medium shade of pink and let me choose whichever desk I wanted lol. This was back before PC took over.