I don't know if they still make them, but Freed of London used to have men's nylon tights that were pretty sheer.
With the trend towards nylon/lycra and some new materials, I think it would be hard to find the lighter weight tights.
One thing you could do is to buy the nylon or nylon/lycra material you like and have someone like www.renaissancedancewear.com make you a pair or two. They also might have some lighter material in stock, but I know they'll custom make alsmost anything in a material you send them.
balletboy[/i]