The phrase "button band" refers to a strip of fabric or a row of buttons found on clothing items, such as shirts or cardigans. It is used to fasten the garment and keep it closed. Full definition
I've knit many things, but I don't knit button bands very often. (knittedbliss.com)
There's a little button band at the top, which is a cute added touch. (bygumbygolly.com)
I love the dark, rich chocolate brown colour, oversized collar and faux leather button band, all of which make the coat look a lot more expensive than its # 79.99 price tag. (hannahlouisef.com)