I just remembered that there is a back door to the
HerRoom.com website, called Her Room for Men. There is apparently a large market out there among men who wear ladies underwear, and this is the only site I know of that caters that market with with standard female items, the same ones it sells on the HerRoom side. They have a FAQ on knickers discussing what are the best styles for those who tuck,, and a lot of other good advice on fit, etc. No sleaze at all, and very discreet -- no need to devise some story about why you are there.