The Theory Sleeveless Tweed Shift Mini Dress features a high V-neck, button-front detailing, and welt pockets for a sleek, structured look. The Theory Sleeveless Tweed Shift Mini Dress features a high V-neck, button-front detailing, and welt pockets for a sleek, structured look. Established in 1997, New York-based Theory creates cool, expertly tailored clothing from the finest materials designed to inspire how you feel, work, and live.