Girls, hello, anyone ever washed cashmere coat in the washing machine?…

Girls, hello, anyone ever washed cashmere coat in the washing machine? I ordered a coat from a tailor for size 46, but it arrived and it's too big. I read online that you can shrink clothes with washing, but I'm a little scared, even though the coat is cheap. If I take it to a tailor, they will charge me twice as much.