Vix Swimwear Siena Slit Maxi Dress in Blue. - size L (also in ) Vix Swimwear Siena Slit Maxi Dress in Blue. - size L (also in ) 100% rayon. Hand wash cold. Unlined. Side seam slits. VIXS-WX771. 336 523 038. Brazilian designer Paula Hermanny offers swimwear made for the jet setter who is both classic and modern. Whether her Vix woman is in St. Barts, Bali, or Monte Carlo, Hermanny's collection of swimwear, which features leather and gold signatures, will always add an element of luxury to the occasion.