Curtain is almost the first thing one would notice on entering a room. Curtains can be put to many purposes, both decorative and practical. They are used to insulate a room, to give privacy and to control light and glare.
Curtains can be selected based on the location or direction of the window, size of the room, practicality, and room paint shade.
If the window is located in east or west direction then you will get direct bast of sun rays in the morning and evening through that window. If that is the case then you should go for thick and heavy fabric with preferably lighter colour as the darker colours tend to fade over a period due to continuous exposure to direct sunlight.
Curtain can change the apparent size of the room. If you want a feeling of more space in a small room, hang curtains in the same tones as the walls.It would be more interesting to have patterned curtains with colors that match the wall color in general tones; the pattern should be small to encourage the feeling of spaciousness. It is also a fact that lightweight fabrics help create a feeling of spaciousness more so that heavier fabrics. If the room is large and you want to reduce the feeling of size, hang curtains o heavier fabric and in strong colors that contrast in depth with those of the walls. If using patterned fabric, choose large and definite motifs.
If you are buying a curtain for your bedroom and you like to sleep in the afternoon or till late on a lazy sunday then go for blackout fabric. This will reduce the sunlight entering your room by 98 to 100 percent.