In response to your question about resistance of various fabrics, I've found almost all of the nylon and poly/nylon hiking shirts made by REI (Sahara, mostly) and Ex Officio (Dryflylite, Airstrip, Nomad, Amphi, et al) to be essentially fully mosquito resistant on the east coast, in rockies, and in california. I have one pair of Ex Officio pants that don't do as well. Not sure why, but they do seem lighter weight than my others. If they're pulled tight against my knees and thighs, a small fraction of mosquitoes are able to get through. (I would guess they were getting through at success rate of < 1% per minute of active probing.) Unfortunately, there were about 200 on each leg when I discovered this. :(
In conditions conducive to long sleeves, long pants, and a flats type hat, I only need about four drops of DEET/day for backs of hands, cheeks and neck. You may choose a different skin repellant, or to use a headnet when not eating, but whatever you use, you'll need a lot less of it (and of sunscreen) if you can use a physical barrier as the major approach.