Another thread inspired this question. Can one attend a Purim party or parade in a pig costume?
It ought to be forbidden as the pig is an impure animal and we are commanded to make a separation between our holy selves and impure beasts as we are instructed לְהַבְדִּיל בֵּין הַטָּמֵא וּבֵין הַטָּהֹר (Levit. 11:47). However, the gimatria of pig (חזיר) is הטהור (the pure one) this reveals that it too contains ניצוצי קדושה and intrinsic holiness which is why it will be permitted in the messianic age. Therefore, on Purim it would be permitted to dress up as a pig for it is really a pure kosher animal (deep down).