I use the Fieldsheer 4-season pants, as they had the most mesh coverage (i.e. fewest solid fabric panels) at the time that I bought them. They also come in silver/gray, which reflects a lot of the sun's heat.
I wear a Shift Airborne jacket for the same reasons - lots o' mesh and silver color. I'm sure I look a little like a space man, but at least I'm not a par-broiled space man!
'07 DL650 ABS
'04 Yamaha V-Star 650 Classic Silverado (gone)
'04 Yamaha TTR225
'03 BMW F650GS (wife's)
'92 Honda XR250L
'86 Honda VT500c (gone)