What shape are you?
My friend had one from M&S, black with zips on the shoulders. She looked great. She's quite small boned.
I tried it but it didn't work for me.
Here it is - styling on M&S website awful as usual.
www.marksandspencer.com/Porfolio-Cowl-Straight-Belted-Jumpsuit/dp/B0033IJ6RO?_encoding=UTF8&category NodeID=&node=42966030&mnSBrand=core&ref=sr14&qid=1279913109&sr=1-4&rh=&page=