Since we've arrived in DC I've been squeezing myself into a variety of suits with a corresponding variety of success. When I was in grad school I bought several suits, for interviews and other events. I wore suits from time to time in Morocco. That was at least five years ago. In Mali and Burkina Faso I rarely wore anything with a defined waist, let alone pantyhose. So it's been an adjustment to wear clothes that are so much more structured. I prefer to buy three piece suits (jacket, suit, pants) and I've been wearing two sets regularly around town.
Since I'm a plus-size petite - the last unconquered territory of women's retail clothing - it's been hard to find anything that fits. Invariably the sleeves and hems have to be altered. I found though that several brands do fit me, and fit me well (after shortening the sleeves): Kasper, Le Suit, and Talbots. Unfortunately suits are by nature stodgy, and I wish I were small enough to try cuter versions. I love this Tahari suit but I'm sure it doesn't come in double digits. Alas.
I think if you go lower-end you'd have more luck. I'm short with a big ole butt and short arms, and suits with some spandex in the fabric work really well. You can get them at JCPenny or New York and Company to name a few places. Those suits fit well, but they don't have that sharp professional look you get from Jones New York or Calvin Klein.