Homemade Dress Full Circle Size S? Ruffle Western Picnic Costume Square Dance

Lying flat, measurements are:
17" underarm to underarm
15" across the waist
40" shoulder seam to hem
Rear zip closure
Sweetheart neckline
Full circle skirt
Red with white pin dots (dotted swiss fabric?)
Not sure about the size (measurements above)

Thanks for shopping Little Cabin Treasures!