How to Measure for Net Curtains
It is advisable to use a metal tape measure were possible and take time to measure carefully so you give exact and correct measurements.
To measure the window width for net curtain, simply measure the inside of the recess from wall to wall (c – d below).
The length of the curtain means measuring from the top of the window recess or the top of the net/tension rod or net wire to the bottom of the window sill or ledge (a – b above). Net curtains usually come in standard drops but can be altered if a window is between sizes. This would mean choosing the longer drop in order for it to be taken up.