Crossdressing.

[basketofseals]

I actually recently completed that story part and upon consulting with Urianger after he confirms that said character DID undergo a change of gender.

That was just the translation team covering up an earlier mistake. That character was repeatedly referred to as one gender before it was revealed in English, and then when the reveal happened they'd learned that they were wrong the whole time. Originally that character was always referred to gender neutrally. There was no gender transformation originally.