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Hydrolysis of polyesters:
Simple are easily hydrolysed by reaction with acids or alkalis.
Polyesters are attacked readily by , but much more slowly by dilute acids. by water alone is so slow as to be completely unimportant. (You wouldn't expect your polyester fleece to fall to pieces if you went out in the rain!)
If you spill alkali on a fabric made from polyester, the linkages are broken. -1,2- is formed together with the salt of the .
Because you produce small molecules rather than the original polymer, the are destroyed, and you end up with a hole!