I used Simplicity 1251 version B and my only alteration was to add a hoodie pocket on the front.
Pictures taken on a larp, in a break from me doing anything useful!
This is a really comfy jumper, as a really quick sew and I'm pleased with everything except the fact the sleeves are longer than my coat sleeves meaning soggy sleeve ends in the rain. Argh!
Oh and we also saw a rainbow this larp!