Two riffs on the same idea:
Horizontal pleats at the top of the drapery panel.
In this first picture, the pleats are of a contrasting solid fabric. The pleated edge is either sewn or clipped to rings on the rod.
The panel appears to be lined.
In the second, the pleats are wider and either fold down on themselves or are lined. The bottom portion is unlined and this is a tab top drapery.
Which do you like best?