pinstripe

A pinstripe is a thin line or stripe that's usually repeated in a pattern. It's often used as part of a design for clothes.

You might have seen businessmen wearing suits with vertical stripes - those are pinstripes! They're especially common on dress shirts and pants, but you can also see them on ties and other formal clothing. The idea behind pinstripes is to create a sense of formality or professionalism, which is why they're often associated with business attire.