For correct tension, try T7.

Measurements
To fit bust sizes
75, 80, 85, 90 cm (30, 32, 34, 36 in)
Length to underarm
41 cm (16½ in)
Actual measurements of top are less than bust sizes given, thus ensuring a snug fit.

Materials (from The Family Knitting Book)
Wendy Courtellon 4 Ply, Marina Crêpe 4 Ply, or Wendy Pure Wool 4 Ply, 20 gram balls.
Colour A: 4, 4, 4, 5 balls
Colour B: 5, 5, 5, 5 balls
Colour C: 2, 2, 2, 3 balls.

Stripe pattern
Knit 8 rows in colour A, 8 rows in C, 8 rows in A, 8 rows in B.