which in the given example would give you 22 cm [8½ inches] of positive ease

The measurements for the finished slipover are listed on the front page of the pattern

Bust circumference: 104 (108) 112 (120) 124 (132) 136 (140) 152 cm [41 (42½) 44 (47¼) 48¾ (52) 53½ (55) 59¾ inches]

5 mm [US4] needles (Please note that 48 rows in brioche stitch are counted as 24 knit sts)

Barbara Balaclava Dregglis which in the given exampleThe Barbara Balaclava is worked from the top down in stockinette stitch. First, a square is worked for the top of the head, then stitches are picked up and knitted along both sides of the square, and short rows are worked to round the top of the balaclava. After this the balaclava is worked straight down and then joined in the round below the chin. The neck is worked in the round in stockinette stitch before it is finished with a rib edge. At the end