Peggy seems to not want to tell Hank she got new shoes and instead says she got a microwave. First, getting new shoes isn't a big deal, it is pretty obvious Hank does not believe that she only wears one pair of shoes, so there is no point in lying. Secondly, in later episodes Hank knows how big her feet are (and if they are 16 it would be very obvious they are huge) so another reason to not lie. Thirdly, it seems very odd that Hank wouldn't notice that the microwave never changes, despite Peggy's claim that she buys new ones a lot. It doesn't seem to be very clear why she lied, and how she possibly gets away with it. And this shoe store is never once mentioned again, the entire series.