I have many of these in 3 different sizes. I lap swim regularly, teach lessons, and lifeguard. I need a tight fit for swimming workouts. For lifeguarding I use a larger fit, since I'm wearing it on dry land for many hours a day. For lap swimming workouts, look at the size chart (IMPOTANT: treat "BUST" as OVERBUST/bra strap size for this chart, not the usual underbust sizing) and go by that or one size up from the chart depending on your cuppage. For casual outdoor and not much swimming, size up 2 sizes from size chart.**Wish they'd re-stock the red suits without any writing on them. Would've bought at least 3 by now.Arrives on time. Thanks!