What I've learned about bathing suits and water physical therapy

• Don't get anything with metal underwires.  Sure, it gives you extra support, but it's much harder to get on (and especially off when it is wet, and you are sort-of crippled).  If this is a bathing suit you'll be wearing regularly, the underwires will start to rust before the suit itself gets worn out.  (You might not mind this if you made mistake the next mistake.) 
• Don't get a tankini top (even if it has adjustable ties on the side).  If you have a larger bust and a narrowish waist and are generally tall, you will spend a lot of time getting gracelessly tangled with the ties as they float gracefully in the water around you, always wherever your hands need to be.  You will also end up basically wearing a bikini and revealing a lot of your waist. This is true whether you try to use the ties to keep the suit close to your body (which requires you to cinch it so tight that it shortens to the point where your tummy is on display anyway) or whether you leave it long to shorten the floating straps.  Water is buoyant, darn it.  And your suit will float up quite happily, anchored mostly by your underwire lines, if you have them, making you glad you are in a pool with a bunch of old people who are hopefully not affected by this display of excess flesh.
• Don't get a suit with a skirt if you are trying to use it to cover up your thighs.  (See above.)
• Don't buy/wear a suit you really like.  A suit worn occasionally over the summer and cleaned well can last for years.  A suit worn weekly will be lucky to last you 6 months of moderate water activity.  So if you buy a suit and like it, for the love of all that is durable, don't wear it for PT.  And if you are looking for a suit for PT, don't buy one that you love and adore because when you realize that it will wear out faster the more you wear it, you will find reasons not to go to the pool for PT.  You do not need more silly excuses not to go.  So just wear the cheaper, less-attractive suit for PT, and save the good suit for when you are with people who care how you look.  (Or when you are with people you care about looking at you or something.)