Shown with a cast-on count of 51 stitches.  

• Rows 21 and 33 (RS): BrSl, k3tog, [brSl, ctr dbl inc, [brSl, k1] 5 times, brSl, k3tog] twice, brSl, ctr dbl inc, [brSl, k1] 5 times, brSl, k1, brSl.
• Rows 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, and 44: K1, [brSl, k1] 25 times.
• Rows 23 and 35: BrSl, k1, [brSl, [k1, brSl] twice, ctr dbl inc, [brSl, k1] 3 times, brSl, k3tog] twice, brSl, [k1, brSl] twice, ctr dbl inc, [brSl, k1] 3 times, brSl, k3tog, brSl.
• Rows 25 and 37: BrSl, k3tog, [brSl, [k1, brSl] 3 times, ctr dbl inc, [brSl, k1] twice, brSl, k3tog] twice, brSl, [k1, brSl] 3 times, ctr dbl inc, [brSl, k1] twice, brSl, k1, brSl.
• Rows 27 and 39: BrSl, k1, [[brSl, k1] 5 times, brSl, ctr dbl inc, brSl, k3tog] twice, [brSl, k1] 5 times, brSl, ctr dbl inc, brSl, k3tog, brSl.
• Rows 29 and 41: BrSl, k3tog, [[brSl, k1] 3 times, brSl, ctr dbl inc, [brSl, k1] twice, brSl, k3tog] twice, [brSl, k1] 3 times, brSl, ctr dbl inc, [brSl, k1] twice, brSl, k1, brSl.
• Rows 31 and 43: BrSl, k1, [[brSl, k1] twice, brSl, ctr dbl inc, [brSl, k1] 3 times, brSl, k3tog] twice, [brSl, k1] twice, brSl, ctr dbl inc, [brSl, k1] 3 times, brSl, k3tog, brSl.
• Row 47: BrSl, k3tog, [brSl, [k1, brSl] 3 times, 1-to-5 inc, [brSl, k1] twice, brSl, k3tog] twice, brSl, [k1, brSl] 3 times, 1-to-5 inc, [brSl, k1] twice, brSl, k1, brSl (57 sts).
• Rows 48, 50, 52, 54, 56, 58, 60, 62, 64, 68, 70, 72, 74, 76, 78, 80, 82, and 84: K1, [brSl, k1] 28 times.
• Rows 49, 55, 57, 63, 65, 77, 79, 81, and 83: BrSl, k3tog, [[brSl, k1] 4 times, brSl, 1-to-5 inc, brSl, k1, brSl, k5tog] twice, [brSl, k1] 4 times, brSl, 1-to-5 inc, brSl, k1, brSl, k3tog, brSl.
• Rows 51, 53, 59, 61, 69, 71, 73, and 75: BrSl, k3tog, [brSl, k1, brSl, 1-to-5 inc, [brSl, k1] 4 times, brSl, k5tog] twice, brSl, k1, brSl, 1-to-5 inc, [brSl, k1] 4 times, brSl, k3tog, brSl.