But according to an opinion that differentiate '道服' from '胴服', '胴服' was originally a garment for covering only the chest and hips without sleeves, and later the sleeves were attached to '胴服' that consequently looked like '道服' that originally had the sleeves.
しかし道服と胴服を区別する説によると、胴服はもともと袖がなく、胸部と腰のあたりだけを覆う服だったが、後に胴服に袖がつくようになり、その結果、もともと袖があった道服と形が同じになったのだという。