The term 'suit pattern' can refer to a variety of different designs, but two of the most common are pinstripe and pinstripes. Pinstripe is a 9-letter word that refers to a pattern of very thin stripes, usually in a contrasting color, that run vertically down a garment. Pinstripes is a 10-letter word that refers to a pattern of wider stripes, usually in a contrasting color, that run horizontally across a garment. Both pinstripe and pinstripes are popular suit patterns, often seen in formal wear.