From what I can tell online, this dressing gown/robe is one size. Shop this style of robe at Catherine D’Lish or resale sites.
The top is available in band sizes 38-44 and cup sizes D-G. The matching briefs are XL-4XL. I found this set at Busted Bra Shop and Brooklyn Fox Lingerie.
This is a set I wear on the regular. It’s one of my favorite Elomi bras and the underwear are SO comfortable. The briefs come in sizes M-4XL.
Shop at Bravissimo! Briefs XS-3XL high rise and low rise, top band sizes 28-40 and UK cup sizes DD-K.
Shop this set at Bravissimo. Band size 28-40, UK cup size DD-J, garter and brief XS-3XL. Available in forest green, black, and white.