What to wear to an informal meeting

What do you wear to an informal meeting on a Monday night. I wanted to look different but still formal in a way for the Toastmasters Exec meeting. I threw on a pair of black pants and a funny yellow to in my drawer. I havn't really worn it before; the top is cut at an angle but is then finished with a skirt-like design to make the top even again. It was kinda cold and raining so I threw on a pair of arm warmers~a different but not to exposing outfit