More Walmart

So admittedly I don't have a great topic today. I have actually been busy doing actual work for once. But while I was listening to caller blabber on about how awful our new system is I had been clicking through pictures at this website:
People of Walmart

What is it about Walmart that makes people think any dress code is appropriate? I know if I'm going to Walmart I don't exactly feel I need my Sunday best. Is it the people walmart cater's to or is there something insidious about the stores that makes people lose all shame?