I would probably get 14s too. TBH I wore maternity jeans and my PJs after my section and it was fine. Didn't need any special clothes except for knickers and with those I just grabbed what was on the shelves (sizes 16, 18 and 22! - am normally a 12). As I pulled them basically right up to my bra it made no difference how big they were.
Gosh I must have been attractive in those early weeks...