It's knitted in doubleknit yarn and I chose West Yorkshire Spinners Essentials (used to be called Aire Valley) which is a 75% wool/25% nylon blend. One of the things that attracted me to the jumper is that the front and back are different colours. This means that if there is a colour that just calls out to you (in my case, mustard yellow) but looks absolutely dreadful on, then you can still use it but have it on the back and then choose a more complementary yarn for the front. I love the way orange and yellow work together to give a look that is fine for Spring and Autumn. The colour scheme would be good for Summer too but the yarn might be a tad warm! You could make it in a cotton yarn though or a lighter wool.
The jumper has quite an unusual construction in that it is knitted from the top down with the back knitted first and then stitches picked up along the side of the front and knitted in as you go (again from the top down). This means that although it is all done in stocking stitch which can be a bit tedious, the construction element stops it from being boring to make. I've whizzed away and got the front, back and part of the sleeve finished in less than a week! One of the reasons for speeding through so quickly is that the pattern is very clear and easy to follow so even if you are a bit of a novice knitter you could make it.
If you fancy having a go at this or any other doubleknit pattern, then pop down to the shop before 5 pm tomorrow and you can buy doubleknit yarn at 20% off (or buy online before midnight).