Hi, yes i'd agree that just above the floor is best if you're worried about dirt collecting at the bottom but it also totally depends on the look you want. Some people choose to puddle their curtains quite a lot intentionally for added drama and I love that look as well. These curtains are just an off-the-shelf (not custom) option and the old floors are uneven throughout so they puddle slightly in some areas and sit just above the floor in others.
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