You should always pack a spare pair of pants, you never know what's going to happen.
The Sun
We didn't have a gaily painted caravan and a spare pair of horses.
Times, Sunday Times
Visit the dentist before you leave and if you wear glasses, carry a spare pair.
The Sun
I always carry a spare pair of gloves.
The Sun
Would it be acceptable to carry a spare pair in my bag, or would people get the wrong idea?
Times, Sunday Times