Notes for the stitch count, first repeat row 1-8;
Row 1= 35 sts
Row 2= 35 sts
Row 3= 37 sts
Row 4= 37 sts
WS=28 sts
RS=27 sts
WS=27 sts
RS=27 sts
WS=39 sts
Row 5= 39 sts
Row 6= 41 sts
Row 7= 41 sts
Row 8= 32 sts
RS=31 sts
WS= 28 sts
Next repeat, the numbers adds with 5 sts so row 1 ends with 5 more= 40 sts
To clearify second repeats number of sts;
40,40,42,42,33,32,32,32,44,44,46,46,37,36,33
Third repeat, the first row ends with 5 more= 45 sts

To make a extencial stretchy cast on and bind off I did this;

Cast on with crochet hook; make a loop, put it on left needle, put hook to the left of loop and fetch the yarn making a long loop 2-3 cm long, twist the loop once clockwise and put it on left needle.* Put hook to the left of stitch, fetch the yarn, make a long loop 2-3 cm long, twist it once clockwise and put it on left needle* Repeat.

Bind off with chrochet hook; put stitch on hook, put hook into next stitch, fetch yarn and drag through stitch= 2 loose loops on hook, fetch yarn again and drag loosely through both loop/stitch.* Put hook into next stitch, fetch yarn, drag through= 2 loose loops on hook, fetch yarn again and drag loosely through both loops. Repeat.