This is a wonderful layering piece. Very easy and fast - just the way I like them.
This garment is worked from the shoulders down, in two pieces and joined under the arms. The top of the sleeves are only partially joined, leaving an opening at the shoulders. The shoulder is decorated with non functioning buttons.

The ONLY part that has to fit you is the waistband, which is a stiff 91.5 cm/ 36 ins.
Sleeve to sleeve: 132 cm/ 52 ins
Length to shoulder: 46 cm/ 18 ins
Armhole depth: 35.5 cm/ 14 ins

If you use the exact same yarn: Serenity Chunky, since they only dye 4 at a time, you cannot make it any larger.

4 skeins of Serenity Chunky= 6 skeins of Rasta, = 5 skeins of Franca

But if you were to use another yarn, in a similar weight, you could easily cast on more sts at the beginning and then take off less under the arms. The sleeves are bracelet length, so a bit more length would be fine.