I think in the first stages of an emergency, the average patriot should wear khakis, basic casual wear and a windbreaker. Exactly what you'd wear for working around the farm.
To me, far more important than clothing is footwear. Are you buying your boots secondhand? (Not recommended). Are you buying them from Walmart? Do you have shoes for your children?
As for combat clothing, there is a huge amount of it floating around on Ebay and the open market. It would be easy now to get 6-8 full BDUs sets, with 2 commando sweaters, rain gear, whites and coveralls.
CK