Come on baby light my fire

I've never run any significant distance at this weight before. Last year when I was training for the half marathon I maintained a weight that was generally just shy of 160 pounds. I wasn't pleased to be running at that weight at the time, but accepted that was where I was at. It didn't really make thing too difficult - all my running tights still fit, my shirts, etc. This year, I'm 10 pounds heavier and now I've got some added complications-

Friction. Last night when I started running on the treadmill in some loose fitting workout pants (not tights)...I noticed the sound of my thighs rubbing together. Honestly, I was actually a bit concerned - there seemed to be enough friction going on for me to light a fire. Although I can say that it didn't end up altering the run, it wasn't entirely the most comfortable thing. I'm thinking it might be a good thing if I can lose some weight before the long runs kick in.

Weight: 169.6
Miles: (last night) 2.6