The reviews for this mask say that it is legal for use in the SCA and another says that they use it for HEMA training.

I don't know what your experience is in regards to working with metal, but I have a buddy who makes gorgets like this one out of 16-gauge steel (hopefully something available at Home Depot) and leather.

For gloves I would recommend getting a pair of gardening gloves or something similar in the $5-10 range at Home Depot.

As far as fighting garb, I'm afraid I can't be much help. I usually just wear a flannel shirt or jacket and jeans to our local practice.