Don’t chuck your old numbers out of your number bib. Leave 3 or 4 numbers in each side (or, if you’re as lazy as me, all last season’s). This gives the bib a wee bit of rigidity, makes it much easier to put the new number in when you’re late for your dressage and makes it lie much more nicely when you’ve got it on.
The extra numbers also come in handy for putting over icetite (contraversial I know!) if you have run out of other paper…..