Civilian versions of woobies are now everywhere - not just the Snugpak jungle version, but from hiking brands. Mines from Kelty. Have a look on Amazon and you will find ones that go from the sort of thing that you could use to snuggle with on a cold evening during a barbecue to the really puffy ones that you could possibly use as a sleeping bag substitute. Many are now filled with down, from Rumpl, ENO, Rab, Alpkit (£99 and apparently great value), etc - and poshly expensive bit nice they are too.
If you fly business or first class, the duvet you get to use is a bit like a posh woombie as well - my wife bought one about a decade ago when she started to fly international for work, which is the Westin - which is great. I have collected a number via Ebay, and the United Airlines Saks 5th Avenue one is lovely. Its nicer than the Kelty one, for a start.
I cant think of any real reason to bother buying a woombie (about £18 from Endicotts, when they have stock) to turn into a hoodie. If you want a quilted jacket, then just go to Ebay and look for a cheap quilted Barbour, etc. Because thats essentially what it is. It will probably cost you less over all (some start at a quid!), and be more practical. Dont know about a hood, but overall much better. And if you want an insulated jacket, then Go Outdoors or Decathalon will do one for you for a decent price. I have one from Decathlon that i got for £25. Or buy something decent but 2nd hand from Ebay.
A woombie or similar is useful for lots of things. But not much point in trying to make it into something its not.