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You do not want a commissioned costume but you are worried if a ready made costume in our shop will fit you? Measure yourself as described in http://juth-design.blog.cz/1107/how-to-take-your-measurements and compare to the table below. These are EU sizes. We do not provide British or American sizes.
Normal ladies sizes (in CM, body height 168 cm)

If a product is numbered S, M, L, XL, XXL then it is elastic and corresponding extension is:
S=34-36, M=38-40, L=42-44, XL=46-48, XXL=50-52
You may commission a costume in confection size, in this case give the size and the LENGTH OF LEG, please.