Do PBT suits stretch out?

[JamesSwim]

Do suits made out of poly and PBT stretch over time? I have some suits made of poly/PBT that used to feel a bit too small, but they feel right now. The suits are several years old and have been used for swimming

There's a chance I may have lost weight, but wondering if it's the suit.

Since PBT fabrics are somewhat elastic, perhaps they stretch out over time?

It seems that 100% Nylon suits do not degrade or stretch over time.

Even though suit makers state that PBT/poly suits are long lasting, they may want them to not last forever, and encourage us to buy replacements.