We recently received a catalog in the mail from hammacher.com that reminded me of the old Sharper Image catalogs. Most of the stuff was way over priced and useless for the average person, e.g., the hovercraft golf cart for $58,000.
Anyways, they did have a couple of cooling hats that looked like they might be good for pwMS...
Baseball cap style - http://www.hammacher.com/Product/81941
Wide brimmed style - http://www.hammacher.com/Product/76559
Oh, for folks interested in inclined bed therapy, they have an inclined mattress topper. It's a bit pricey though.http://www.hammacher.com/Product/83235