wearing 1.5-2inch suit for normal swimming

[Torchwatch]

You have three main choices:
Wear a suit made from an Endurance fabric, not as stretchy and thicker than Lycra but does last longer. Briefer suits tend not to be available in Endurance fabrics.
Wear a nylon suit, a durable non stretch fabric, can be worn very thin and moulds to your body.
Wear a Lycra suit and enjoy it but buy a new one now and then.