I don't often find a pattern exactly the way I want it. I do like to use patterns, however, because most of the work is done. Want a round collar instead of a pointy one...round out the points. Wider legs...cut them wider from the hip. Once a collar or pants or sleeves have been sewn...a good deal of knowledge is there. Add a collar to a shirt without one. Raise the rise of a pair of pants. Think it through. The easiest method usually works. :)
I've made this particular pattern a couple of times before (thank you Marilla Walker! It's a good one!), so some of the adaptations are already proven...raised rounded neckline, straight seam across the back, back cut on fold, removed pleats, lengthened pockets. A few alterations were added...one size smaller, shorten the bodice, increase the rise of the bottoms + pockets to accommodate, lengthen the button opening, widen the legs, shorten the legs to shorts.
What are you working on? I'd love to hear! :)