DH's 3 kids got married, first one wanted him in a tux and rented it for him (knew we couldn't afford it). Second one didn't care, third one rented him a suit (he does not have any that fit, he is not a suit kind of guy).
On the first one, we were talking to DH's brother about the tux and asked him if he would rent/wear one for one of his kids. He said he didn't mind the renting but would not wear one. DH was just the opposite.
DH did look very nice in it, (sort of like the godfather) - he did not even wear a suit when we got married, so it was a treat to see him in one and have pics.