i would buy good used clothing at places like Goodwill before i would get anything cheap at one of the "Marts" where it would be made in China of who knows what quality.
Maybe people should stop buying iphones, ipads, Nike's, Pierre Cardan, Hermes and all sorts of quote/unquote 'name brand, really good stuff' because its made in China. Apple isn't shy telling consumers its products are all made there and they are the richest company in history.
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Why do you need to buy new stuff for back ups? Just take items that are serviceable in your closet but not worn often and use that. Extra pair of BDU bottoms, belt extra pair of wool socks, extra tee shirt and jacket. We all have these items in our closet that are perfectly fine except they no longer fit our 'current' fashion style this year. But remember this, dry and warm: never go out of style.
Specifically for Walmart footwear, I was on a trip and needed a pair of gortex boots really quick and Walmart was the only place open I could get to, and they were just fine. in fact I used them for yard work and back ups for a couple more years. They weren't even their name brand stuff like Caterpillar and Wolverine