We make a lot of custom clothing and we want to tailor the clothes we make to fit you. It's easy to take your own body measurements. 
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One of the best websites I have found is Sew Mama Sew.They have clear instructions with good pictures that demonstrate how to easily measure yourself the right way. You could even get a friend to help you out and make it a little easier on you. 

If you ever place a custom order with us you can use this resource to easily provide us with your accurate measurements so the clothing you receive from us will fit comfortably and look great.