While you're waiting for other answers, you might want to check out /u/chocolatepot's answer here. He also links to an older post where discusses masculine and feminine clothing in infants.

Followup question - I've often heard this presented as an example of the arbitraryness or socially constructed nature of gendered norms and aesthetics, but who first used it as an example, and in what context? Is it still a good example?å