Sometimes, there are projects so amazing, so jawdropping, so beautiful that you feel that you must knit them one day.  
Sylvi is that project for me.  It is stunning.  I picture myself strolling, ney sashaying down the catwalk, I mean street.  I see myself smiling as other women gasp in awe at my lovely creation. 
The only problem is what yarn?  I mean, I'd need a lot and it could really add up if I pick something expensive.  However, if I am making a lovely jacket that I will wear for always, perhaps I should invest in some quality yarn.  (Thanks for pointing that out, Andi.  Like I need an excuse to purchase expensive yarn.  
Remember this?)  And how do I know if the yarn I select will stretch out over time?  I plan on having it lined so that it will be warm and to give it a little added structure but will lining the sweater be enough to prevent sagging?
I think I'm going to have to just ask a whole lot of people who knit this lovely sweater.  Thanks, Ravelry, for once again connecting knitters. 
What do you think, Dear Readers?  Help a knitter out.