This is a beautiful light yellow raincoat by London Fog made for Woodward & Lothrop, a landmark department store in Washington DC. The shell is 100% textured polyester. The lining feels like a cotton blend and has a whimsical retro pattern. Five big yellow buttons down the front, a pocket on each side, and a slit up the back.

The tag says 14 Petite and it seems true to size, but here are the measurements when laying flat:
Bust: 21"
Waist: 20"
Hips: 22"
Length: 43"
Sleeve Length: 23"

This item is sold from a vintage boutique in Roanoke, VA.