I wore a grey, very lightly sparkly jumper with a big snowflake motif the other day. It was originally bought as a Christmas jumper but it's become a bit bobbly since, and I have another, nicer Christmas jumper now, so, yes, why not? If I don't wear it more often than at Christmas, it wouldn't get worn at all and what a waste that would be of a good garment. But then, I'm not one of those people who buys things just for a short season, eg Christmas pjs. If I had Christmas pjs I would wear them all winter.