I try to have as little exposed skin as possible. Heavy long pants, long sleeved shirt, long socks, hat, gloves and facemask. All of this clothing gets treated with permethrin spray days ahead of time (has to dry). Sawyer's is the common brand you'll find in big box stores, but if you shop around on amazon you can get a concentrate that's much cheaper.

Additionally I spray the lighter weight clothing (shirt and facemask) and the exposed skin around my neckline with 40% DEET spray in the morning before heading out.

It seems to take care of the skeeters for the first month of the season until the nights start getting chilly in October. The permethrin spray lasts over a month and doubles as tick repellant, which is a huge plus in the Lyme infested area I live.