1920's French navy linen pullover sailor shirt.
A faint stencil print from 1923 remains visible.
The fabric, which is typical of vintage French linen, is thick and feels quite heavy.
The cuff part has a very beautiful French indigo blue color.
I think it's a pretty rare item.
FRENCH NAVY LINEN SAILOR SHIRTS VINTAGE 1923 – WANDERER (wanderer-shop.com)