New materials

[Torchwatch]

A thin Lycra fabric with a high Elastane content will stretch around you like a second skin, you may forget you are wearing them, but chemicals in the pool water and the ultraviolet in day light will rapidly break down the Elastane leaving you with a floppy nylon suit.

A frequent swimmer may prefer an Endurance type swim suit, the fabric is thicker and the Elastane content is reduced. This will make the suit last longer for daily training. This suit will not feel like a second skin.
Around the leg holes are 2 or 3 layers of fabric and a loop of elastic. The greater thickness of an Endurance suit will be doubled or tripled and may be noticeable. At the points where the front, back and other panels meet the total thickness of fabric is again doubled perhaps forming a noticeable lump of fabric that could make the wearer uncomfortable in the water and even sore if a swimsuit is worn as underwear.

if you don't like your Endurance type suit put it at the back of the closet and get a new Lycra suit but be prepared to replace it if you swim every day, or are lazy and leave your swimwear in soggy plastic bags.