I don't understand why when you hover over the word "thick," Duolingo lists "gros" as an option in additions to épaisses. But the correct answer is épaisses. I was marked wrong using gros. Then why list gros as an alternative???
"Avoir" can be used relative to clothing items in the sense of "to have on". Elle a des gants noirs = she has on black gloves. In this way, it may also be understood as "wear", i.e., she is wearing black gloves (also, elle porte des gants noirs).