Office casual has risen to a new level of slovenly. It's not casual Friday anymore, it's jeans-and-sneakers Friday. Tank tops are perfectly acceptable provided they're worn with slacks. While I'm not a fan of suits, it'd sure be easier. Get 2 black suits and alternate them with different blouses. Dry clean on the weekends.
So for those in offices that still require "business attire," meet the USB tie. Show your employer that you're a multi-tasker in the office and on the go. Totally more office appropriate than the USB bra.