Has anyone had luck finding stores in Kunming with a decent selection of pants for men 6 feet / 180 cm or taller ? I would appreciate any suggestions for specific places to try shopping.

Yes, a store in our street called A&A+
Don't know if they have other stores in town.
I love their trousers and the quality is superb! They can get you any western size usually.
Metro stop: New Asia Athletics Park. PM me for directions if you need them.

I don't need tall - I need wider (unfortunately). I'm going back to Canada next weekend so I'll just shop there.

uniqlo has 180 cm.