1. Add a border: Sew a border of contrasting fabric or trim to the bottom of the curtains to add length.
2. Use a tension rod: Install a tension rod above the window frame and hang the curtains from it. The tension rod will add an extra few inches of height.
3. Mount the curtains higher: Hang the curtains closer to the ceiling or at the top of the window frame rather than above the window. This will create the illusion of longer curtains.
4. Add curtain extenders: Purchase curtain extenders, which are panels of fabric that are sewn to the bottom of the existing curtains to add length.
5. Use a valance: Hang a valance, which is a short curtain that covers the top of the window frame, to create the illusion of longer curtains.
6. Replace the curtains: If none of the above solutions work, you may need to replace the curtains with ones that are the correct length.