The Snapdragon soaker is good and an easy knit though I find it comes up small - find your size using your measurements and you will get a good fit
I agree with Louise with the yarn - I only use aran weight 100% Merino/Organic Merino/BFL really, or a heavier chunky yarn for night time soakers - I find these work best
Lots of places to buy - PixieKnits is good for WAHM dyed, Colinette, Fyberspates, Cascade 220, Artesano and lots more commerical dyed
Good luck