My wife doesn't do forums but does ride in a wide variety of clothes including a fair bit of Italian designers. She visits
https://www.themall.it/en/outlet-italy/homepage.html every couple of years for a spree. I don't think she ever dresses differently if riding vs driving except that she will not ride in a long tight evening gown. Then again, she hates wearing long tight evening gowns so only does when it's really really required.
She has three bikes at three different places: Workcycles Gr8 (she's Swedish so it's Swedish blue & yellow) and two Workcycles Omafiets. She says the keys are; 1) the drivetrain and brakes are all internal and fully enclosed, 2) step-thru frames, 3) good fenders, and 4) fully upright. She has a couple of poncho's that she sometimes wears. If it's heavy rain and she has to dress quite nice then she'll usually drive instead of ride. Like many European women she wears very little make-up.
She does not generally ride in a way that she'll sweat. EG, slow and upright.
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