I like wearing Dr. Scholl's wooden sandals
, but I can't find them (men's) in the shops anymore. So I decided to try making a pair by copying the shape of the original. The distinctive feature of this style of sandal is the ridge or or bump that fits between the ball of the foot and toes, preventing slipping. The back is also carved out which stops the heel sliding sideways. The strap is well forward, allowing the foot to rise naturally on the toes when walking. Pressing down with the toes to "retrieve" the sandal while stepping forward produces a distinctive "clop, clop" sound.
I believe Dr. Scholl designed the original sandal carefully, based on a study of the natural barefoot gait.
Later versions, especially in women's styles, diverged somewhat from this ideal.
This shows the finished sandals (a bit dirty; I've been wearing them in the yard).
Total cost: about $25 ($5 for the wood, $20 for a commercial sole). Using an old car tire for the sole might work - I tried, but had trouble cutting the steel belting.