sen Allistair Dress in White. - size 2/M (also in ) sen Allistair Dress in White. - size 2/M (also in ) 95% micro modal 5% spandex. Dry clean only. Fully lined. Ruched side detail. SEN-WD112. ALLISTAIR. Delicate washed silks and fashion forward ingenuity are what make Sen elegantly simplistic. Focusing on classic and easy silhouettes with a modern sensibility, this Miami-based brand will integrate into your existing wardrobe with ease.