A good polycotton lining suitable for all curtains.
A more luxurious 100% cotton lining. This lining will make your curtains hang better.
As the name suggest, a useful lining if you want a dark room when the curtains are drawn. Often used in bedrooms. Can also help with draughts.
This lining is very effective at draughty windows or in bathrooms, making a room feel warmer.
Lining doesn't just come in a cream colour. There are many different options. A coloured lining can be striking as a contrast colour.
In addition to the above lining you may choose to also interline your curtains. This adds a fullness and plushness to the curtains and has thermal properties.