A young girl in a pink bikini jumps into the air on a sandy beach by the ocean, as two other children play in the sand.
The girl in wearing a bathing suit.
Girl, is a rephrasing of young girl.  A bikini is a bathing suit.
A pink bikini is a bathing suit so the girl is wearing a bathing suit.
A young girl is a girl and of her in a pink bikini jumping into the air on a sandy beach means wearing a bathing suit.