This style is also known as reverse pleat or box pleat. Inverted pleat curtains are made with a reverse single pleat at the top of the curtains and are suitable for all types of windows. These are made fixed width to fit the length of the track. Again these can be face fix or top fix depending upon the location of the window. The fullness is around 1.8 times the track length. These can be thermal, lined or sheer curtains.