Our local chain of thrift stores had a Veterans Day sale - 50% off everything. Since I was planning to try on some tops, I had my breastforms and bra with a ladies V-neck sweater, but everything else was in guy mode.
As I was moving to get in the long checkout line, I saw one woman looking around, and she made eye-contact, then glanced down at my boobs, glanced somewhere else, then looked back at my boobs. For about a second, her eyes got as big as saucers before she looked away.
That's the first time I've seen any noticeable reaction.
This Friday I have a doctor's appointment for my semi-annual physical (or "wellness checkup" - I'm not sure how thorough it will be in this day when everything is dictated by the insurance companies and Medicare). I'm thinking of wearing my bra, panties and pantyhose and see what happens.