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 rangedeth107
by DiyArtiePie
by Valena DIY
by Natural Style
by CbyS Paracord and More
by Knitting Stitch Patterns
by Shyam Diwani