I took the line about buying women’s clothes as just something funny to say. We haven’t seen every moment of the Doctors life. Could have been any number of reasons.
I particularly liked the scene where The Doctor is irritated at Tim Shaw for pulling a tooth from someone he just killed, as though that crossed the line for totally disrespecting the victim. She seems genuinely more bothered by that than the killing. For me, that’s the kind of depth of character & scene that’s been missing the past few years.