This is mainly stockinette stitch with a bit of ribbing at the bottom to make it more roomy nearer the elbow.

Originally made for my BIL who is normally a Men’s Medium
Confirmed metres of yarn used to follow, approximately 120m using worsted yarn and size 6mm & 8mm needles:
http://crochetfish.blogspot.co.uk/2014/12/simple-knitted-...

Finished size:
Length: 37cm
width at base: 24cm (circumference)
width at hand: 20cm (circumference)

Did another test using a known DK yarn to get the length of yarn right and used 4mm needles
The finished measurements are:
Length: 28.5cm
width at base: 17cm (circumference)
width at hand: 14cm (circumference)