Competition Suits should be one size smaller than a practice suit. They should be very snug, no wrinkles, maybe even a little uncomfortable! Don't wear your competition suits to practice every day!
New swimsuits get looser with age so don't buy them with room to grow.
Practice suits should be more comfortable fitting. The practice suits will have a little more drag in the water which helps build up the muscles. Many swimmers will wear 2 practice suits for even more drag in the water. If a little hole develops or the seat wears thin, just put on another suit over it! Board shorts do NOT make good practice suits.
Rinse immediately after swimming to get rid of all the chlorine and chemicals.
Wash by hand only with mild soap. Hang dry.
Do NOT use the washing machine nor dryer.
Wear shorts over the swimsuit during the meet to keep the seat from wearing thin.