Why not, I used to do it when my
DD's wore disposables. They were mainly in cloth and I used to put nappy, cover then pretty cover.
Some of the outfits we were given had over covers with them, these were mainly with dresses so they look great no matter what sort of nappy they had on.
Have a look in the cloth nappy section, they will be able to give you plenty of advice on covers. Also look in the BB Market Place section as you can get them from members who make their own.
Some of the ladies make some really pretty ones.
All the best with your upcoming birth.