D.E.C.K by Decollage long sleeve shirt. We often sell these shirts as a layer underneath a piece of knitwear, as the collar and cuffs are a nice detail. They come up very small so we would recommend the following:-
Small- size 8, Med- size 10, Large- size 12, Extra Large- size 14, Extra Extra Large- size 16.
Fabric- 90% Polyamide 10% Elastane