Prior to Megan waking Don in Lady Lazarus, we had never seen this character without makeup.
Back at work the next day, she had a full face on. Mid-sixties makeup is elaborate, there were false eyelashes and everything. Subsequent to quitting though, we never saw her in makeup again. We saw her at home twice, both times bare-faced, including on her way out to acting class. The casual clothes for an acting class where you lay on the floor make sense, but most people want to look great in their acting personas, so the choice is striking.
It seems to me we’re seeing a Megan who has stripped away her inauthentic, false face, and is now showing the face that is truly hers.