This is a Liz Claiborne Dressy Pullover Top with Metallic Threads - Size M
The sleeves are ruffled or bell shape towards the ends.
Polyester/Viscose/Cotton/Metallic
This top would look great for a party/wedding/dinner.  I tried to get the shiny metallic flavor of the top, but it doesn't come through on my camera phone.  The top is very sparkly because of the metallic threads.

Measurements:
Shoulder to waist   - Approx 25"
Round collar to waist - Approx  22"
Arm Pit- to Arm Pit - 18"
Width of waist  - 18"
Sleeve length - Almost 20"