Regarding the size change. Depending on the brand there is some stretch as lycra ages, especially if used in chlorinated pools. Chlorine breaks down the fibers in the fabric. This may also be the problem with the Body Glove too. If the fabric is stretched to the max the fibers actually do break and show up like little white hairs on the surface. This is combined with the stretching and shrinking of the fabric and the effects of the high chlorine content in public pools.
When you rinse it out it should be off your body otherwise all you are doing is washing the chlorine on your body through the fabric or into it. The water temp should be barely warm to cold. This will help the fibers to contract. It is better to dry both flat rather than hanging them - the weight puts undo pull on the already fragile fabric.
The best thing you can do to preserve your Lycra blend suits is find a salt water pool, sometimes called fresh water. It isn't like the ocean, the water is like the saline solutions used in hospitals and as an eye wash. You won't taste or see the effects that ocean water has on your suit or body.
Remember when buying your suits, the higher the nylon content, the longer they will last. Anyone that has ever had 100% nylon suits will confirm that nylon isn't destroyed by chlorine and last for years or even decades.
The two main things to remember is don't use hot water and don't hang to dry.
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