Weldons # 156182, vintage sewing pattern, dated circa 1940s, printed in London.
Misses' Nightgown.
Floor length nightgown has short, puff sleeves and fancy bodice.
Bust: 36 inches / 92 cm
Hip: 40 inches / 102 cm
The pattern is unprinted, and appears to be unused, and still factory folded in its original paper wrapper.
More '20s, 30's and '40s patterns here:
http://allthepreciousthings.com/collections/1940s