- bay track
- A curtain track that bends to follow a bay window's angles, allowing curtains to sit close to the glass and draw around corners. Can be flexible for curved bays or rigid with angled joints for box bays. Choosing curtains for bay windows
- blackout lining
- A curtain lining treated or woven to block light completely, used in bedrooms and media rooms. More effective when curtains fit closely to the window frame. Choosing curtains for bay windows
- fullness
- The ratio of fabric width to window width, usually expressed as a multiple. Standard fullness is twice the track length, giving soft pleats without excessive bulk. Choosing curtains for bay windows
- interlining
- A soft layer sewn between the face fabric and lining, adding weight, insulation and a luxurious drape. Increases bulk and cost, so suits larger bays with solid fixings. Choosing curtains for bay windows
- pencil pleat
- A heading style with narrow gathered pleats formed by pulling cords in a tape sewn to the curtain's top. Adaptable to most fabrics and works on both tracks and poles. Choosing curtains for bay windows
- stack-back
- The space curtains occupy when fully drawn open. Gathered fabric needs room to stack without blocking the window or light. Choosing curtains for bay windows
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