Depends on the angle you are taking. If you are the "designer" - designing the clothes that your models will be wearing, well, you have to know inches and such, to be able to size up your clothes properly. Now, if you are the "model" - than I'm not too sure ;) Sure, you probably don't need to know calculus, but basic arithmetic, algebra would be good to know at least.
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yes. to understand the higher maths you need pre algebra
To estimate numbers more easily.
Information on indices maths can be found on the Laerd Mathematics website. There are many examples of formulas which one may find informative and useful.