I look so much better in a damn dress... ah well. Thanks for the confirmation
A modest, business casual dress or a blouse and tasteful skirt should be fine for most firms. Most of the attendees from the law firm will be going straight from their offices and few firms actually require suits day to day anymore. You'll see some people in suits and some in business casual. If you have to be the most conservatively dressed person there, wear a suit. However, no one will judge you for not wearing something with a jacket if you wear otherwise tasteful business attire.