Dickiesmens Deluxe Blended Coverall Work Utility Coveralls (pack of 1)

I'm looking for a size that would fit my 10 year old and he's a size 16 in the waist. What size do you recommend? Thanks

Im 6'5'' about 210. What would be the best size

Will they skink when you wash them?

I ordered these and they didnt have zippers. I want to order some more but I have to have the zippers.