Before A Show, NYC, September 2015.
I think this is the same pretty Rosie Assoulin blouse Leandra wore here. 
Recreate her look (kind of):
Off the shoulder top — MLM Label Willow top, J.W. Anderson Off the shoulder top (love this one! The pale stripes are so lovely),  Caroline Constas Zoe Off the shoulder top, Milly off the shoulder stretch-cotton blouse, Ellery Cyril off the shoulder cotton-poplin top, ASOS stripe off the shoulder top, Tibi off the shoulder blouse, Caroline Constas Zoe Off the shoulder bustier top, or One Teaspoon off the shoulder top
Self-belt/paperbag waist skirt — Ports 1961 paperbag waist skirt, Isabel Marant Harmon miniskirt, Reiss Leonie belted skirt, Emilio Pucci paperbag waist pencil skirt, Marc Jacobs belted silk mini skirt (gorgeous with an off-the-shoulder top for evening, or tee for day), Suno mini skirt, Burberry London belted pencil skirt, or Isabel Marant Ice belted mini skirt.