Abstract
In order to find the most suitable length of the needle for sewing Japanese Kimono, the author investigated with 150 college students the length of thumb and the manner of holding a needle.
Relations, classifying by thumb-length, between the length of needles and sewing efficiency were investigated by evaluating the length sewed in a certain period of time and uniformity of the stitches.
For sewing two pieces of cloth together, which is the most common practice, a needle whose length is 67±2 % of the thumb length was proved to be most suitable.
Minimum time required for the test was also determined by statistical means and thus the test time was reduced to one-fifth of the ordinary test time.
