Does your man constantly take inventory?
When we meet out at a restaurant or when I come over to his place, he always lays his hand mid-back to see if he can figure which bra I'm wearing. Sometimes he'll query, "Leopard?"
He also goes low, to the small of my back, to discern thong, bikini, or granny.
He tries to be smooth and inconspicuous about his curiosity, but he fails. I'm onto him.
It could just be a crude male thing.
Or it could be a wise divining rod to quickly test the waters, to gauge the mood up front for the evening via lingerie.
Or it could be like shaking a present. You know you're going to get it anyway, but it's fun to try to guess what's inside.