Translation tools have a hard time with this font. It first suggested “acting partner”, then it thought it said “gardener”. I did some searching, and I believe it’s “theater partner”, as in this guy is her date to the theater(movies?), she realized she was overdressed compared to him, and then traded clothes with the other woman.
‘Theater partner’ is literal translation. Basically it is her date for an actual theater performance.
The implications is that going to a theater or opera means you have to dress up. It was still true about 30 years ago.
The basket and wallet indicates that she thinks he is dressed for a date to go to the piac (kinda farmer’s market but not fancy at all think of fish market just no fish).