straw sandals, tread on
屨 centers on footwear made from woven plant material, specifically straw sandals, and by extension the act of stepping or treading while wearing them.
屨 combines 尸 (a body or dwelling) with 彳 (step) and 婁 (a phonetic component), suggesting footwear for walking. The exact historical development is uncertain.
Under the roof-like 尸, a person 彳 steps into woven straw 婁 to make sandals. Picture treading on straw that has been shaped into footwear.
For ク, imagine stepping into cool straw sandals on a hot day: cool -> ク, and the straw cools your feet as you tread.