Visiting NOLA/the US for the first time - clothing shopping / supermarket recommendations?

Hello! I'm visiting New Orleans (and the US in general) for the first time on a work trip, and wanted to dedicate some time to shopping.

What are your recommendations for:

• clothing: dresses, semi casual, sportswear (I like UA a lot), outlets
• I wanted to experience a huge American supermarket, and bring back home some snacks in unusual flavours - on my list I have Walmart, Whole Foods, Target, Costco, but open to suggestions, don't know which one would be best since my time is limited

Edit: staying near the French Quarter

Thanks!