No, but English probably is. I would worry a lot more about English then the math. I'm guessing basic math would be needed for measurements and for the business side of things but that's it.
I'm not a fashion designer, I'm an Engineering student, but I don't think you have to worry much about math, only English and your social skills.
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You just bases of maths :) No need to have a Maths GCSE :)
what course can be done without maths
You can of course design pretty buildings but without the math you might not understand why they cannot be built! In the US and in Sweden mathematics are an important part of the architecture courses offered at most universities, but in Denmark there are schools that do not have as stringent engineering requirements.
No, but it is important.
Both are very important. However maths could still be taught in other languages if English were not available.