Gǔdài de xiákè yāojiān chángcháng pèi zhe yì bǎ jiàn.
The wandering swordsmen of old often wore a sword at the waist.
Tips
usage
间 'between, in the area of' after a body word gives a location, mostly in writing and storytelling: 腰间 'at the waist'. In everyday speech 腰上 is more usual.