The French-blue, button-up shirt is a classic. It can be worn to work or worn casually. It can be paired with nearly any color, neutral or bold.
This J.Crew shirt is a great option if you want something with a menswear fit. If you’re looking for something with a more feminine cut, the classic Brooks Brothers non-iron shirt is a good option.
I’m also a fan of Banana Republic’s shirts. In my opinion, the quality has stayed fairly consistent over the years. I own their blue Oxford shirt (on sale for $55, also in petite) and I love it. If you want something in a more “corporate” fabric, their sateen non-iron shirt (also in petite) is also a good bet. And if you’re a penny pincher, don’t buy BR at full-price. They have sales every week (usually on Tuesdays) where you can save as much as 40-percent-off.
If you’re looking for something more casual, a chambray shirt is an option in some workplaces just make sure to choose the right fabric. I like this tailored chambray shirt from Gap and this softened chambray shirt from LOFT (also in petite). Looking for an inexpensive option? This Merona shirt from Target looks good, though I might change out the black buttons.