While I do appreciate and understand the dress code (and see no need to have it changed).....

I think the NRSA's only poor choice in this "scheme" was to solicit the rental/purchase from people at that gate.

As long as he/she had the correct attire on (for the entire flight, not just to board), I see no problem.

While much more expensive, I am sure there had to be at lease one store at SFO with mens shoes?