Water molecules have a positively charged side and negatively charged side. The molecules that make up the fabric *also* have a mix of positively charged and negatively charged sections. Opposite charges attract, causing the fabric to literally pull the water up into itself, further and further through the empty spaces in between the individual fabric threads. The relevant search term is “capillary action”.
Gravity is not an especially strong force, and is *routinely* and pretty easily “defied” by electromagnetism. See also: every magnet on your fridge.
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