The Shoulder Cozy by Churchmouse Yarns is probably the most versatile accessory I own. I made it last year and have used it in all four seasons. My darling neighbor modeled it showing how you can wear it in all it's variations.
When I'm leaving the house and if I think there is a possibility that I /shudder/ might get a teensy bit chilly, I put this in my purse. My husband likes to say that there's no bigger complainer than a cold Kristen. Even if it's 90 degrees outside he's learned to ask, "Did you remember to bring something warm to wear in case you get cold?"
The suggested yarns, use a strand of each held together,
Rowan Summer Tweed
Rowan Kidsilk Haze
Summer Tweed has recently been discontinued,
but as long as you get gauge (with an open weave)
I think the yarn possibilities are endless.
Get the pattern here.
All the details on my Ravelry project page.
If you are ever in Seattle, a visit to Churchmouse Yarns would be so worth your while.
Bainbridge Island is a half hour ferry ride from Seattle.
The little island is so beautiful and walker friendly, you won't want to leave.