Michelle Obama's fashion choice was considered "diplomatic" by many. Reuters

First lady Michelle Obama, 51, attended the State Dinner Tuesday night in honor of Japanese Prime Minister Shinzo Abe and his wife, Akie Abe, wearing a blue gown by Japanese-born fashion designer Tadashi Shoji. The Chicago-born wife of U.S. President Barack Obama wore the flowing dress and within minutes the designer, 67, known for elegant evening wear, began trending on social media sites Facebook and Twitter.

“OMG…the DRESS,” one Twitter user said of Obama’s choice of evening wear.

Some called the first lady’s fashion choice diplomatic, since she chose to don the design of a Japanese designer to meet with the Prime Minister of Japan.

Shoji’s designs are carried in more than 700 major department and specialty stores in more than 50 countries. The designer launched his own line in 1982, and has maintained a loyal fashion following worldwide, with celebs such as Katy Perry, Helen Mirren, Octavia Spencer, Dita von Teese and Kate Beckinsale counted among his fans.