I LOVE this long and light coat. I think this shall be my next purchase for autumn.
Here's how I'd get this look:
COAT: Theory | Wool & Cashmere Trench Coat
TEE: Topshop | Raw Edge White Tee
JEANS: Karen Millen | Cuffed Boyfriend Jeans
SANDALS: Missguided | Cross Strap Block Heeled Sandals