Even though Spider-Man bit the dust in Avengers: Infinity War, we all know that he's coming back. There was talk of the film taking place prior to the events of Infinity War, but that is becoming less and less likely.
The following information comes from Spider-Man: Homecoming and Ant-Man and The Wasp costume designer Louise Frogley. He tells IndiaWest:
"I am not actually working on that film, but the costumes will have very big changes because, in the film, Spider-Man becomes more like a man and not a teenager."
The fact that she says Spider-Man will be more like a man, tells us that some years will have passed following the events of the Avengers films.