How to measure
For a spacious, comfortable garment like a kimono or a bathrobe you need a few sizes. Your waist size, the length of your arm, and the length of the jacket itself.
It’s useful if someone can help you do it, but you can also do it all by yourself.
Here’s how it goes:
Waist: grab a measuring tape and measure the circumference just above your navel. If you want a very loose-fitting robe, you can measure over your clothes. If you want a well-fitting jacket (which is better with a skirt-transfer model) you’d better take your clothes off.
Sleeve length: Let your arm hang down and hold the beginning of the measuring tape at the joint of your arm and shoulder. Take the measuring tape in your hand and bend your arm towards your belly button and measure from hand to shoulder. The measuring tape now runs from your shoulder over your elbow to your wrist. Look how much it is on your wrist.
Total length: Grab the measuring tape and hold it to the last vertebra in your neck – that’s a lump that you can feel well in most people. Hold the measuring tape with one hand. If you have someone around, that’s fine. Then they can help you measure. When you’re alone, it’s just a little trickier.
If you bend down, your measuring tape drop, of course, so you have to hold it before you’re bent over so far that you can read the size.
Why don’t you take a look at this video? That’s where I’ll show it.