An Alliance for Paired Donation reception: "Business Attire"

I got the following invitation by email: I assume that the photograph is to illustrate what is meant by "Business Attire" (so surgeons won't come in scrubs...)

Join us in honoring our esteemed colleague,   Alvin Roth, PhD,   winner of the 2012 Nobel Prize in Economics During the ATC Meeting Saturday Evening, May 18th in the Willow Room At the Sheraton Seattle Hotel 1400 Sixth Avenue, Seattle, WA 98101 Time: 6:00 - 8:00 p.m. Business Attire Please RSVP By May 7th 2013 to reserve your seat l-r, Alvin Roth, PhD, with King Carl Gustaf XVI of Sweden at the Nobel Prize Ceremony

.Among Dr. Roth's achievements, the Nobel Prize Committee cited his work with the Alliance for Paired Donation (APD) in developing the algorithms that are used in the APD and other kidney paired exchange programs. After drinks and  hors d'hoeuvres, there will be a short presentation by Dr. Roth and  by Dr. Alan Leichtman, co-investigator of the Alliance for Paired Donation's Agency for Healthcare Research and Quality (AHRQ) sponsored study to propose a standard acquisition cost (SAC) for kidney donors who donate through the mechanism of kidney paired donation.