Not ideal but I have seen worse! Cream, beige, white or pale canary would be better but as long as your friend looks smart & professional I don't think it will be a problem at unaffiliated level.
Dont look too bad hun - I thought you were doing the dressage?? Would be better if you had slightly lighter i.e cream etc but for your first time they would do fine....
If you want to PM me, with size, I've got some cream/beige that are too small that she could borrow or buy for small amount. I'm not that far from you either.
See thats the thing i don't really know what size E is, the ones i'm wearing there are a 26 waist but they are really short, as in i have to wear knee high socks with them or i have a massive gap!