DD is doing her DOE bronze this summer. Have just bought boots to break in and will be getting a DOE hoodie so all is good there. She has things like plain cotton t-shirts, thicker cotton cargo trousers, cotton joggers long and short which I was thinking would be ideal, but she says they've been told to avoid cotton as it soaks up sweat and becomes heavy if wet. Will she failed if she turns up with cotton things? I'd prefer her to where them as I think she'll feel cooler.