When I worked at fashion startups in New York, women did wear outfits like this, including the engineers. The engineer in question is in Buenos Aires where both sexes tend to have a bit more flair.
This reminds me of working with crotchety gen-X and above sysadmins. They complain about "hipsters" but the people they are talking about are wearing standard issue clothes from the mall that everyone in that age bracket wears. They don't realize that wearing a "JavaConf 1999" fleece, bat-belt, cargo shorts and Tevas is not what other people consider normal work attire.