Having stripes — lines or bands of colour running across or along something. A zebra is striped; so is a tiger, a candy cane, a school tie, a deckchair. The lines are usually a different colour from the background and usually repeat: one stripe alone is not really 'striped'.

You can say which stripes: red-striped, blue-striped, or more naturally 'a shirt with red stripes'. You can also name the size: pinstriped (very thin lines, on business suits), candy-striped (narrow, usually red and white).

Pronunciation trips people. It is one syllable — /straɪpt/, rhyming with 'wiped'. Some older or more literary speakers say two syllables, /ˈstraɪ.pɪd/, especially before a noun, but one syllable is the safe modern choice.

Compare it with its neighbours: striped = lines, spotted = round dots, checked/checkered = squares, plain = nothing at all. Those four cover almost every patterned shirt a student will ever need to describe.