I think the seller is way more in the wrong than you are - lacking somewhat in basic customer service skills.
The thing is fabrics can age badly - your jersey might have been fine at the time, but twenty years in a cupboard can be bad for fabric.
i know i am being a pedantic on this thread but oh well, might as well reply. . . i think that if it cant handle wearing once while a 99p top from primark can that it is of poor quality
I think the seller is way more in the wrong than you are - lacking somewhat in basic customer service skills.
The thing is fabrics can age badly - your jersey might have been fine at the time, but twenty years in a cupboard can be bad for fabric.