The Rema (Hilchos Purim O.C. 696:8) relates an incredible chiddush:
He cites the work of the Teshuvos Mahari Mintz Siman 17 (Rabbi Yehuda Mintz, Italy 1400’s) that there was not only a custom for people to wear masks, but to cross-dress as well. Men would dress up in women’s clothing, and men would dress up in women’s clothing on Purim. There is no issur of Lo Silbash in this case since they are only wearing it with the intention of simcha, not for zenus. We also find a similar idea with regards to wearing kelayim dirabanan that this is permitted on Purim since it is only intended for simcha. Some argue that there is in fact an issur in this however the custom is to indeed allow it. More so, even if people grab from one another out of simcha there is no issur of lo sigzol.

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