The Sir the Label Blanche Asymmetrical Gown in Black Made from a thick linen, this dress is the perfect dress to dress up or down this spring summer. Features a one shoulder and The Sir the Label Blanche Asymmetrical Gown in Black Made from a thick linen, this dress is the perfect dress to dress up or down this spring summer. Features a one shoulder and Sir The Label Blanche Cut Out Dress in Ivory TikTok White Dresses Linen, Mini, Midi, Cut Out & Halter SIR. SIR the label Dresses Sir The Label Blanche Dress Size Us4 Poshmark Cut Out Dresses White, Black, Print & Floral SIR.