When I was going through a lot of clothes, I would box them up by size and put a one year expiry date on them. If untouched for one year, they go.
Today 5 boxes 'expired' so off to donation they go.
By happy coincidence this might work out for others for the holidays, (wish I had actually planned that).
I intentionally did not open them, but I know there's good stuff in there.
The car isn't full, I think I'll look around for what else could be better used by others...