1960's YELLOW summer SHEATH DRESS 60's S

Late 1950's/early 1960's sheath dress from R&K Originals. The fabric is GREAT... I don't know the exact fabric content, as there's no content tag. But it's a light, soft, slubbed weave. Maybe a cotton/rayon? Back metal zip closure. Unfortunately, it's too snug for my bum. :( I wear a 6 on the bottom, and I would say this is more of a 4. Measures 35/26.5/37", no stretch. 15" shoulder to waist seam, 39.25" total length. Fabulous condition... The slubbed texture is the way the fabric itself is designed, it's not a flaw or wear. (G8)