Inspiration...Popover Top

 I rarely find a top that I want to purchase.  This one is it.

This is the Covered Button Popover Top by Ann Taylor.  Price tag: $79.50.  Details: Split Neck, long sleeves with cuffs, button front, relaxed fit, gathered shoulder, gathered back yoke, 25 1/4" long.

I was unable to locate a similar pattern.  However if you are the creative type, you could probably take an existing pattern and recreate the look.