Eyelet diameter — pick one
40 mm is the classic size; 60 mm creates fuller, more sculptural folds.
Pleat depth — pick one
Two-finger pleats are sleeker; three-finger pleats are fuller and more luxurious.
Pencil depth — pick one
A lighter, flatter top vs. a deeper, more luxurious one.
Cottage pleat depth — pick one
A subtle 5 cm pleat keeps the look soft; 10 cm gives a fuller, more pronounced ruffle.
A pair is two curtains meeting in the middle. Most windows look best with a pair.