I didnt get a slouchy effect because I didnt use recommended needle size. I only had 100 gr of wool and nearly used all of it. Very well written pattern, easy to follow, a quick knit and I simply love love love the way the decreases are formed.
I used Very Pink Knits tutorial for stretchy rib bind off, because i ended up knitting the rib section last (dont ask). It is very good and easy to do.
Will definitely knit another, with the correct needles.