- 100% Silk - Crystal Embellishment - Button Front Closure - Split Cuff - Blouson Sleeve The East Of Istanbul Curved Collar Blouse is a handcrafted silk silhouette designed by our in house artisans. Reimagined in an exclusive limited edition print, our curved collar blouse is relaxed fitting and features a button front closure for effortless wear. Finished with generous blouson sleeves that taper into split cuffs, it's decorated with intricately placed crystal embellishments.