This sleeveless fair isle waistcoat is worked in fair isle with a 4ply yarn.
Sizes are described as:
Boy/Teenage/Small Mens/Medium Mens/Large Mens
Yarn requirements 50g balls:

Marron Glace: 3/3/3/3/4
Ecru: 4/4/4/5/5
Fer 1 all sizes
Aubergine 2 all sizes

Also requires 5 buttons