Broken lozenge twill would be a good choice I think. Otherwise known as broken diamond twill.
Here's a detail from my Y1K coat in broken lozenge twill. It's a pleasing pattern. Perhaps too repetitive?
Of course summer & winter is infinitely variable, and I could stick with it for awhile.
This sampler (front and back) was woven in varieties of summer & winter mimicking Fair Isle. Greyed out they'd make good background, and otherwise they'd make good pattern texture. 8-]