I've a suit that DS1 wore a few years ago. It's light beige cotton (jacket lining is cotton/poly mix)
Trouser label says washing is fine, jacket says dry clean only.
Ds2 fit said suit and might have to wear one soon but is quite different in his colouring to DS1 and as a result looks a tad washed out in light beige.
I've some navy dye here, the suit weights just under the required 600g too, and I'm very tempted to stick it all in the machine and see what comes out.
BTW I say he "might" because I don't really care if he does or doesn't wear a suit, granny would like him too though and I'm happy enough to go along with her wish, but I'd prefer it that if he does he doesn't resemble a ghost!!
So would you?