This tea cosy is quite thick. I used two strands of DK and 4 mm needles.
Make 2 pieces and sew them together leaving a gap for the spout and the handle.
Cast on 33 stitches and work 4 rows reversed stocking stitch starting with a purl row.
Continue in pattern
1st row : Knit 1, *next stitch – wind yarn twice round needle (W2), purl 5; repeat from * to last 2 stitches, W2, knit 1.
2nd row: Knit 1, *yarn forward (yf), slip 1 purlwise (s1p), yarn back (yb), knit 5; repeat from * to last 2 stitches, yf, s1p, yb, knit 1.
Repeat these 2 rows until 32 rows have been completed.
Shaping rows :
Work pattern as usual in between shaping rows, reducing the number of stitches between the W2 stitches accordingly.
33rd row : k1, *W2, p2 tog, p1, p2 tog, repeat from * to last 2 sts, W2, k1
39th row: k1, *W2, p3 tog; repeat from * to last 2 sts, W2, k1
41st row: k1, *k3 tog, p1; repeat from * to last 4 sts, k3 tog, k.1
42nd row: k1, *pick up horizontal loop lying before next st and purl into front of it, k.1; repeat from * to end of row.
43rd row: k.1, *W2, p.1; repeat to last 2 sts, W2, k.1
44th row: k.1, *yf, s1p, yb; repeat from * to last st, k.1.
45th and 46th rows: as 43rd and 44th rows.
Cast off in rib.