Light can pass through fabrics depending upon the porosity, thickness, and gsm. The sheer and transparent clothes allow more light to pass through the material which are intendedly used in see-through dresses.
More in thickness, tight weave or knit, heavy gsm and dark color do not allow the light to pass.
There are some chemical finishes available which can turn the harmful UV blocking which is useful for countries like Newzealand where the exposure to harmful rays is more.
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Answer:
Light can pass through fabrics depending upon the porosity, thickness, and gsm. The sheer and transparent clothes allow more light to pass through the material which are intendedly used in see-through dresses.
More in thickness, tight weave or knit, heavy gsm and dark color do not allow the light to pass.
There are some chemical finishes available which can turn the harmful UV blocking which is useful for countries like Newzealand where the exposure to harmful rays is more.