No fabric label, would guess it is rayon
Short kimono sleeve
Blouson style bodice
Piping trim on both sides of bodice
Convertible collar
Side button closure
Belt loops, but original belt has been lost to the ages. I didn’t even try to find something else
A-line skirt with 2 small pleats on either side
Smocking detail at waist on back
The label on this gave me a little giggle: it says “fits average Americans”. Not anymore label, not anymore! But I do think R & K Originals is still made! Hang on, let me google it…yep! Looks like they are sold at JC Penney.