Boat shoes look best when worn without socks or with no-show loafer liners. Several companies offer no-show socks specifically designed to be worn with low-cut boat shoes.
Clothing company Richer Poorer Inc. sells a line of no-show loafer liners with silicone grip inside the sock so it does not slip off the heel. Sperry Topsider also offers loafer socks in a variety of colors; these are designed to be worn with boat shoes.
J. Crew's no-show loafer socks come in basic black, white and gray. Goldtoe brand loafer socks are made with antimicrobial fibers, and they are a good choice for consumers concerned with foot odor.