So I bought the jumper I was talking about (re:) and spent an hour staring at it, trying to figure out interesting outfit combinations to use it in. Then, realizing I needed professional assistance, I did some online research and found an interesting bunch of ideas. I now know I can wear this jumper...
1) on its own:
2) under a drape-y cardi:
3) over a long-sleeved top and/or with a belt:
So, all in all, brilliant investment!