Autopsies are not routinely done unless required by law. Cremation is not allowed. This is because traditional Jews are prohibited to desecrate a body by artificial means.
Burial is a plain wooden casket with no metal, that includes no metal handles or even nails.
They are put together with wooden pegs. The body is clothed in a white linen shroud and not street clothes. Shrouds are sewn without knots, and are a multiple piece garment. But such activities, I believe, have stopped. Perhaps in the ultra-orthodox communities it might still take place.