Hmmm, well i got an email from suzanne saying the M are a bit smaller in the crotch. which might be tricky for us. But i do have a preloved M high rise on the way (hopefully) and I shall be able to compare the two properly then. Must say the BBSS fit that little bit better in the leg department than the WNSS, but maybe thats coz charlie wears a M BBSS
hmmm, i'd say a medium, unless you want more stuffing space, in which case a large but with a specially made lower rise (say 16") and possibly an extra set of poppers x