As soon as people say yes to having their picture taken I start work - always afraid they will change their minds. This means I have to do them more or less where they are standing. However tempted I am to ask subjects to come with me and stand by the magnificent foxgloves in Brooklyn Botanical Gardens, I have never asked, and I doubt if I would get anybody to agree.
I also assume that everyone is on their way somewhere so this cannot turn into a morning's work. I adopt a certain speed but no rush. This couple were on a street with too much distracting contrast in the background. I didn't know what to do. Casting around I spied a good background a hundred yards down the street. All was well: they were going that way.
You can't ask people you meet in the street to go home and change if you don't like what the are wearing. I did like what this couple were wearing though it was puzzling. We have a woman in a summer blouse but a woolen winter skirt and carrying a leather jacket on an 85 degree day.