From Longman Dictionary of Contemporary Englishshoulder-lengthˈshoulder-ˌlength adjective LONGshoulder-length hair hangs down to your shoulders
Examples from the Corpus
shoulder-length• My hair is now shoulder-length and will have to stay that way.• Elaine, his wife, was much taller than him, with shoulder-length blonde hair and long legs carrying a well-rounded body.• Models sported immaculate centre-parted shoulder-length hair and the beginnings of goatee beards.• Mark Reynolds was in his late twenties, tall and very thin, with shoulder-length hair held under a knitted skullcap.• Her shoulder-length hair obscured her face, though Alice moved position to try and see more than a slab of cheek.• One fellow with a high forehead and Iank shoulder-length hair sang some poems, accompanying himself on the guitar.• Q I have shoulder-length hair which is greasy at the roots, yet the ends are brittle and dry. 