Neat! I think the one on the left is a sailor of some kind and the one on the right might be some kind of spanish folk costume?
After staring at them for a minute or two, I also think something naval (that jacket has to be something military), and something folk-ish. The folk/regional girl has some nice long braids hanging down!I'd love to hear a definitive answer on these. I assume they needed no explanation at the time.
Drum roll....Fancy Ball Dress--A Lady in Sailor's Costume--Costume of a Swiss Peasant[It occurred to me that I could look up the text of the Belle Assemblee edition.]I do love how posh a "peasant" becomes in a costume, just like all those shepherdesses would too.