The M1PW increase gives you a one-stitch, almost invisible increase on the wrong (purl) side of your work. The sweater on the mannequin is called Ecuador, and the pattern can be found here: ...
by 2lovepolymerclay1
by Shin Art
by Jana
by Knitting Machine Step by Step
by Helena's Craft
by VeryPink Knits
by Pink Cake Princess