corsets bustiers in Diverse Women's Clothing
This looks like a bra pattern but I think it could be used to create a style bathing suit
Didn't click the link but the chart shows bra measurements for bra making.
Pattern for top/bra
(Again, foundation for a gown under which you cannot or do not want to wear an additional undergarment.
Bikini modeling scheme Retro type Sunquini size M.
Bikini modeling scheme Retro type Sunquini size G.
Bikini no overlook