The half-Windsor knot is often also referred to (incorrectly) as single Windsor knot. It is a broad, triangular knot and is therefore suitable for shirt collars with widely spaced points. It is named after the Prince of Wales, later the Duke of Windsor, who took a liking to big knots in the 1930s.
Fil-coupé refers to a special method for adding patterns and textures to fabrics. Yarns are woven in and then partially cut off, leaving behind eye-catching effects and patterns. This can also be done with stretchy fabrics, and it is then referred to as fil-coupé stretch.
Houndstooth is the name of a plain woven fabric with small two-colour checks. It is often used interchangeably with Pepita.