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Yes, it is. Keep in mind that it's waxed cotton, which is a waterproof fabric.
If you're after a non-waterproof cap, I'd be happy to order the fabric, but it'll take a few extra days.
I can do do white/purple, no problems - you'd just have to indicate which colour each panel should be.
Since mine is a three-panel design, I'd suggest the side panels in one colour, and the central panel/strip in the contrasting colour.
Is that purple cloth still available? And if so could you do one that alternated panels of white and purple?