Q02 The size of my lower half of the body fits Medium size though the upper-body is Large size. Although there is no size of any brand for good-fitting to my size....

A02 RS TAICHI has many size variation for racing suits, Refer to " RS TAICHI SIZE TABLE " If your upper and lower size is different, it better to choice "combination size order" .   This order style is to choose the size of upper/lower separately.This is up charged lower than custom size order.*Apply only to Japanese size.