I think I need a new swimsuit. Any advice on selecting one?
Do you really need a new one? Only if a) the fabric of yours is so thin as to reveal what's underneath, b) there is no elastic in the leg openings anymore or c) the seat is fuzzy enough to give you the appearance of a Playboy Bunny tail.
If your current suit qualifies for replacement, here is a simple formula for choosing a bathing suit: the older you are the more skin you must cover. For example, a 25-year-old can wear a bikini, a 35-year-old a two-piece with a sliver of midriff showing, a 45-year-old requires a one-piece. Once you are a dues-paying member of AARP, keep the oversized t-shirt on when not underwater.