Two notable solutions are found in proposal's window decoration 1. The delicate curtain is attached with loops instead of rings and hooks. And the window scarves stand out because of the wide leather pieces, that serve as loops. They are "riveted" to the fabric with large thimbles. Such thimbles are commonly used for truck tarpaulins (The business directory can help with procurement). But you don't need to get the expensive special tools. Try our wooden ball method!
As with curtain rods, tension cables are attached to wall brackets. They are mounted on the walls to the left and right of the window. However, the tensioning cables can also be fixed to the adjoining walls with special holders, so that the curtains run across the whole window front. To hang the curtain, the tension rope is passed through the eyelets or rings in the fabric. Then the wire is hooked into the wall bracket and tensioned. Tension rope sets are available with five or ten meters of rope.