If there's one thing I've learned as a fashion writer, it's that workday confidence often comes down to your outfit - and more specifically, the right blouse. It's the piece you're most aware of as you sit, stand and move through daily meetings and water cooler chit chat. When your top looks flattering and feels comfortable, everything else in your day just falls into place. In case you're wondering, these 13 tummy-slimming office blouses from Amazon are the styles I keep coming back to for workdays.