It is a fine, filmy cobweb seen on grass or bushes or floating in the air in calm weather, especially in autumn, apparently because somebody thought the webs looked like the down of a goose. his sense eventually inspired the adjective gossamer, which means “light, delicate, or tenuous or insubstantial” – just like cobwebs or goose down.
Also, this is used to depict similar looking fabric and hence mostly used in fashion world to depict fine and thin material.
Example
>In dreams, I floated like a gossamer and vanished into thin air
>He fell into a sleep light as gossamer, and a dream that seemed equally light.
>The fine line between loyalty and betrayal is like gossamer
>I have no idea what place these gossamer threads occupy in the economy of nature.
>Fairies are usually depicted as wearing gossamer or tattered clothing