If someone is making the curtains for you just give them the sizes as measured. If your having a go at making yourself then (take a tranquilizer) you need to multiply all your width sizes by 2.5 to allow for gather.
I like to think of this by relating it to conventional offline organizations. Many local companies rely on passing trade and neighborhood suggestions. Most never think of having an online presence and if they do it is merely a basic info web site. But, picture just what might and would take place if an offline company (including such companies as local plumbers, hair salons, chiropractors) captured the clients that are exploring the the web every day for the services these companies supply. Picture, if when someone researched for hair salons in Maine, your company came up before their eye balls. The subsequent thing is a phone call and a scheduled appointment is made.
Window treatment ideas for this kind of window are to not set the curtains to wide off the window. Probably only 15cm at most. Even though you have a lot of fabric to stack back when they open. You can use tie backs to hold them off the window. Another option is to use a thinner fabric.
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