The correct pattern for the pattern stitch section at the beginning is below:
Pattern Stitch, using 3.5 mm needles. Over 2 sts.
Row 1 (RS): k1, *yo, k2* rep from *to* ending with yo, k1.
Row 2: p3, cast off the 1st of these 3 sts over the 2 sts.
Rep these 2 rows.
When decreasing, the pattern stitch will be irregular.
(When working a WS row of Pattern St within the garment work as foll: p3, work in Pattern Stitch to last 3 sts, p3).