I have visited Kyiv 3 times this last winter. My outer clothing was in black, by accident rather than design, and I found, of course, that I looked like a well-off Ukrainian, as testified by my lady who didn't want me to stand out, for economic reasons. I was always addressed in Russian in the first instance. Of course, I introduced my lady (who speaks good English) to O'Brein's (Irish Bar), a bit of home from home with the food and football (soccer) (her introduction to my 'culture'). In there, if we wanted to be alone, there wasn't a problem. Yes, we had casual conversations with visiting English and Dutch, one who lived only a few miles from me at home, but nobody ever 'hit' on me the way that you relate. Maybe only the cool and organised get to Kyiv in winter. It was clear that a majority of people there were British or American expats, who, understandably, see us 'social' visitors come and go everyday and need and heed us not.
So, what to wear in the summer. I'm bound to wear blue jeans and often, a white t-shirt, which my lady says is a sure mark of the west. Do Ukrainians wear black in summer? Will there be 'tourists' wandering around looking for someone to ask where the action is? It won't matter. I shall be in a small village, at festival time, near the Russian border, where everyone will know that where I'm from, and who I'm with, and why. My only concern is to at least learn enough words in Russian to be polite. In that place for sure, if I was to meet another Brit, they will surely have an interesting story to tell.