The shop saleswoman is not hitting on you; She's only trying to make the sale. Don't get duped.
"Oh my god, those cobalt blue chinos look so hot on you!" Coming from a shop saleswoman, this is the equivalent of a stripper acting like she thinks you're hot shit because you're about to drop an extra $250. When an assistant at a men's store is trying to make the sale, she, like any good salesperson, will likely tell you that she'll take you home to meet the parents if you buy that $700 suede bomber jacket, son. Wake up.