I'm with you there, it was frankly hilarious (and a joyous memory), I was about 20, mid 1990's. There I was, on lingerie with two female sales assistants and in would come the awkward fellow:
Him: Errr, I'm, errr, looking to buy some, err, underwear for my wife, for Christmas.
Me: Of course sir, do you know her size.
Him: Err, no
(oh jeez, thats a return straight away)
Him: Do you stock, err, err, suspenders.
Me: SUSPENDERS (loud voice), absolutely sir, we have a wide range of SUSPENDERS. at this point the chap would invariably make for the stairs and my two female colleagues would be crouching down behind the sales desk in fits of laughter.
The fast show was on at the time, and I modelled my "lingerie saleman" persona on the "suit you" sketch, much to the amusement of my colleagues! - no internet back then for reviews of course, but we did get piles of returns after Christmas, box loads.