Fionna Dress by Poseur PS2526Poseur. PS2526 A vision of modern romance, our Fionna formal dress by Tania Olsen Designs blends timeless craftsmanship with contemporary allure. The corset bodice, lined at the front and illusion at the back, features delicate lace appliqu detailing that exudes refined femininity. A square neckline with built in bra cups and spaghetti straps that lace up the back offers both structure and elegance, creating a captivating silhouette from every angle.