kirtle (sometimes called cotte, cotehardie) is a garment worn by men and women in the Middle Ages or, later, a one-piece garment worn by women from the later Middle Ages into the Baroque period. The kirtle was typically worn over a chemise or smock which acted as a slip and under the formal outer garment or gown/surcoat.

Kirtles were part of fashionable attire into the middle sixteenth century, and remained part of country or middle-class clothing into the seventeenth century.

Kirtles began as loose garments without a waist seam, changing to tightly fitted supportive garments in the 14th century. Later kirtles could be constructed by combining a fitted bodice with a skirt gathered or pleated into the waist seam. Kirtles could lace up the front, back or side-back, with some rare cases of side lacing, all depending on the fashion of the day/place and what kind of gown was to be worn over it.