Elomi is made by the same people as Fantasie, Freya, Favue and Goddess bras. They have this seamless smoothing underwire foam molded bra in cup sizes up to K. You can read about who has the widest size range, and measures for US sizes, who has the best price and which store has the most reviews for these bras on my Elomi’s Seamless F to K cup Large Cup Bras article.
As usual the cup size is the tricky part: Figleaves measures for us and gives us the US equivalent of most of these bra’s sizes they carry. So if you go by what Figleaves tells us and you need a H cup you order a FF, and for a I cup order a G and for a J cup order a GG. Well some sizes like 36, they don’t carry in a GG size. At the moment their selection of this bra in 36 goes E-F-G-H. On the other hand these bras are made by Fantaise. I wear a 36 Panache, yet in a Fantasie bra I’m swimming in a 36 and they do carry 34GG which = the J cup size I’d wear.
Yet I have a Fantasie bra in an HH cup that fits snug in the cup, but well. Figleaves measures the Panache Super Bra Tango II full figure bra in a 36J that I wear all the time to equal a US 36M. The only thing I can make of this is that bra cup sizes, and apparently even inches of bra band, vary greatly between manufactures.
So I guess the idea is to, if you are going to try this At Long Last Seamless Large Cup Bra (!!!), you’d gauge by what size Fantasie, Freya, Favue or Goddess bra fits you best? That would be my best guess.