Riller & Fount Polly Mini Dress in Brown. - size 1 / S (also in ) Riller & Fount Polly Mini Dress in Brown. - size 1 / S (also in ) 74% rayon 21% poly 5% spandex. Dry clean only. Unlined. Slub knit fabric. RILL-WD622. H16 POMN. Back to basics this fall with Riller & Fount. Simple silhouettes and dramatic colors are perfect for any season.