Ruffle Blue Summer Spring Swing Tiered boho short dress

This is a beautiful blue swing tiered dress. Has elasticized bell sleeves. 3 tier Ruffle design with tie back to cinch it and fitted to your waist. Size tag says F which I have no clue what that means. But I think can fit up to a large. I wear a medium and this fits a little loose which is perfect fit for a flowy fit. There is no fabric tag. But it feels smooth and soft to touch. And cold if that makes sense. So maybe a cotton/poly blend. Approximate measurements: Shoulder to shoulder:15” Pit to pit:21” Sleeve length: 18” Pit to bottom of dress:22” Top to bottom of dress length: 32”