This black crewneck sweater from Andersen-Andersen is part of their Sailor line.
Andersen-Andersen
Auralee
Maison Margiela
Tcc
Howlin'
Lemaire
COMME des GARÇONS
Jil Sander
Camber Sportswear
Ymc
A.P.C.
La Paz
Carhartt WIP
Libertine-Libertine
J.L-A.L
Stockholm Surfboard Club
Rier
Mhl By Margaret Howell
Margaret Howell