Son going to a BS with formal dress. How many jackets/ties/dress shirts do you think are adequate? Trying to plan early. So maybe I won’t have to spend a fortune on this stuff while he is still growing. Also, any clothing item maybe not listed on the schools list that your child found helpful?
DS went to a formal-dress school prior to BS, and he has formal dress at dinners weekly now. We found that 2-3 blazers was about the right number, with dry cleaning every couple of weeks. Nordstrom house brand is really good - high quality and not that expensive. If you have a Jos. Banks near you, they always seem to have a “buy 3 get 3 free” type sale going on, as well. I LOVE Lands End wrinkle-free shirts; they come out of the dryer like a dream, and are well-made. DS mostly wears khakis, with the occasional green or red pants (Vineyard Vines) thrown in. We found that in winter, a sweater vest or zip-neck lightweight sweater was nice to add warmth under the blazer. Good luck.
@hellomaisy I only wish he could wear men’s clothing. He is so slim, but with long legs. I get his school khaki pants custom hemmed at Lands End. The shirts are a great tip, thanks! How many do you think he will need? They are formal dress every day. 7??
Without knowing the exact dress code:
2 or 3 jackets (one navy)
6-8 button down shirts (min 2 white, 2 blue, 2 striped)
3-5 ties (assuming that 1 is a school tie)
5 pairs of khakis
1-2 pairs of dress pants
I would err on the side of less not more. Unless your son has stopped growing, which is unlikely, he is bound to go through a growth spurt making all those clothes look like they are being worn by the Incredible Hulk (a reason not to shop too early before the fall, too!). Also, he may find his taste will change once on campus and sees what others are wearing. Some boys are very fashion conscious, others could care less.
Well, it is a formal dress code, so options are a bit more limited, but I do agree that less is more for the reasons mentioned above, plus the fact that closet/drawer space is limited, assuming your kid actually puts his clothes away. 
Ditto on the space allowance; I think it can vary a great deal from school to school and even within from dorm to dorm or even room to room (at SAS, lol). Love the discounting, ease, quality (for age group) of Lands End, but we’re hardly label conscious.
We too are going to a formal dress school, Tabor, and are trying to figure the same thing. So far we’ve gotten pants but a struggling with jacket choice. I’m thinking a navy, black and khaki jacket. I’ve found Land’s End has a great selection of shirts so hopefully they won’t require too much ironing.
You say that like you think your son will actually iron. =))
Knowing him he probably would, only because he’d be wearing a tie. Now any other time nope.
You may want to check to see if irons are even available or allowed. Often they are not for fire hazard reasons.
One good way to pick sport coats that will allow him to fit in is to go through the school website and look at the photo album or other places they have pictures of the boys in coat and tie.
I highly suggest looking for the no-iron cotton shirts. My experience is that each dorm has an iron and ironing board., but I think they are rarely used. 
http://www.landsend.com/products/mens-tailored-fit-supima-no-iron-pinpoint/id_242781
http://www.brooksbrothers.com/mens/dress-shirts/0203,default,sc.html
I agree with @doschicos on both counts. I would certainly not send your son off to school with an iron unless he’s Felix Unger. But an iron should be available in the dorm.
One of my favorite CC posts EVER was posted by @D’yerMaker years ago on a thread regarding jackets for boys (I’m still wiping away tears):
And, yeah, the ironing thing isn’t going to happen.
When I was a dorm parent, the most frequently asked question by moms after Thanksgiving break was “Why did my kid come home with a lot of clothing that isn’t his?” Get ready for that. Sometimes the other kid’s clothes don’t even come close to fitting your kid. ( I think they throw all their dirty clothes in a big pile and then take turns doing the laundry…)
@ChoatieMom , thanks for the reminder that boys are still boys, even if they are away at a fancy schmancy boarding school. 
I could totally see my son using an expensive blazer to soak up a spilled drink near a computer or stop an overflowing toilet if that was what was closest to him at the time.
DS has a blue blazer for year round use then a tweed blazer that rotates in for the winter and a lightweight seersucker or similar blazer that does early fall/spring . We do the seasonal switch at Thanksgiving and Spring break- as most posters have noted, not much room for storage . Also allows for me to do some inventory control and keep the shorts etc from becoming winter costuming or coasters/dust rags /spirit week flags!
My DS thus far: 3 blazers he wears regularly. 1 hound’s-tooth, 1 silver, 1 navy (the first 2 get worn MUCH MORE than the navy). Unless he swiped one of hid dad’s, he does not have a school tie. For some reason, I am thinking that is reserved for upperclassmen. Bow ties are a senior privilege (Tradition, tradition! Tradition!) (Sorry, our community theatre did Fiddler on the Roof last summer) For shirts…if your son will be using the schools laundry service, find out when it runs from his dorm. DS’s picks up on Friday and delivers on Monday, so he doesn’t need quite as many shirts. Also, his shirts come back nice and crisp and neat on hangers from the laundry, so no iron needed. He’s only used the actual dry cleaning portion of the service twice. Of course, he has also never changed his bed sheets… For ties, He has a bunch. He went through his dad’s collection, his grandpa’s collection, and bought a few new. I’ve also heard him mention wearing other boys’ ties. They’re small and easy to have a lot of, so it is a good way to add personality. Pants…Your son sounds like mine…tall and skinny. You may want to consider buying a waist size up, especially if a belt is a required uniform component. I only suggest this because the pants that fit well at the beginning of the year are now in the donate pile, and the ones that were a size bigger are the everyday pants and are rapidly being grown out of.
This probably varies by school, but if your son is doing band, orchestra, etc. then a white dress shirt and black pants are usually a necessity.
Traditions vary by school. At my kids’ school, all grades wore bow ties.
Boys share clothing just as much as girls do and a fair amount are definitely into fashion, much more so than our local public school.