baggy tobi trousers (seven-tenths length)
A specific style of tobi (construction worker) trousers where the baggy portion occupies about 70% of the total leg length. A niche term used in workwear contexts.
Among steeplejacks, Kawasaki-shichibu trousers are reputed to be easy to move in.
The term likely derives from the Kawasaki area and the 'seven-tenths' (七分) proportion of the baggy section, but the exact origin is uncertain.