One year our son sold his house and stored most of his things until he found another place he liked. During that period, almost every time we saw him, he had on Birkenstocks–one black, one brown. He said that he had a similar pair in storage.
Remember the unmatched socks in Harry Potter stories? I think I should start knitting!
The little shaver came up with some holiday style of his own. His brother has a pair just like them, in reverse.