Adidas: Early 80's
Between 1980 and 1983, West Ham United wore a simple Adidas template kit comprising of The Hammers' traditional claret shirt with light blue sleeves, white shorts and white socks (see below, top left). That same template was also worn by several other teams around that time, including Wales (home and away) and as Swansea City's away kit. Here below is an attempt to show how other teams may have looked in that same template.

West Ham United
Home 1980-83
(Original)

West Ham United
Away

Arsenal
Home

Arsenal
Away

Coventry City
Home

Coventry City
Away