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I would say this depends on your son. My 15 year old enjoys wearing a suit and thinks he looks fantastic!!! He also enjoyed the compliments he received. We bought it inexpensively from an outlet store., so no need to spend a fortune when they are still growing. But you will find that on RCI ships in the caribbean there will be plenty of teenagers wearing a variety of trouser/shirt combos if he doesn't want to dress up.
No, there will be no need for him to wear a DJ but if he wants to wear one then he'll fit in very well. I would suggest that you try to convince him that he would look great in a bow tie particuluarly with a white shite and I'm sure that would go down extremely well with no jacket or with a jacket. .... Neil.
I usually adapt the school uniform. Black school trousers will suffice for formal nights with a nice white shirt put with a bow tie. I know alot of schools dont go for the blazer, but I rummage around in the sales and pick up a black school blazer usually for under £10. Put this together and he will look great. For the less formal nights when you still need to dress up a bit again the black trousers with a nice shirt. Alternatively places like Matalan and even asda and tescos over xmas were doing the full works Proper Dinner suit for around £40.
My children are 13 and 10. They wear normal suit & tie for formal and casual/smart trousers such as chino's with a casual short sleeve shirt on other nights. They do this for me and I let them wear their Jeans when we use the windjammer.
Yes I am with you on this mine are older and a suit and tie was no problem but I think a dinner suit and a bow tie would have been one step to far for them.
My son who's same age wanted to wear a tux and as he's 6'3" and still growing I didn't want to buy his own as he's outgrowing clothes at speed. We opted to hire one on ship which suited his height, etc and he chose his own waistcoat and opted for the matching tie. It was good to see him dressed up out of the usual jeans and tracksuits and he thought he looked great (so did the girlfriend he found onboard!). He opted out on our last cruise Xmas time and went for trousers and trendy shirt/tie/waistcoat ensemble. This was a caribbean one and it did seem more relaxed on formal nights. So in answer I'd leave it what he feels most comfortable in, they tend to change out of the formal clothes back into casual stuff and head off back to the teenagers hangout. Be prepared to see very little of him - mine did more partying than us and really enjoyed! Have a good time!