Stock Bin Clearance Vest?

I decided to work on this vest... This pattern is from a Japanese Knitting Book called "Sekai-no Amimono" and the photo is on hte front cover. This original vest uses a yarn called "Cortona", but I couldn't find any substitute yarn for this, and I have decided to bring some of my yarns in the stock bin and combine them to look a bit like the original.

I probably have to do awful amount of "weave in ends" finishing...