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How to dress narrow windows
Measure the window horizontally to determine the width.
Hold your tape measure at the left side of your window, then stretch it across until it reaches the right side. Ensure the left side measurement starts at 0.
Measure width of the inside trim of your window if you are planning to get blinds Measure the window vertically to determine the length. Hold the tape measure at the very top of your window, and pull it downwards until you reach the bottom.