My DH & DS1 are involved in SIL's wedding in mid November.
I think the amount we are being expected to pay for outfits is extreme but an unsure in the etiquette as I paid for my bridal parties outfits (but only had bridesmaid and best man).
Also, prior to deciding on a certain suit did you consult everyone before hand to see how much they would be willing to spend?
(And the suits have to be bought, the chosen suits are not available for hire).
To add, flights & accommodation to get us there is costing us $2000 alone.