@_@
Everyone is jumping in with recommendations but it isn't entirely clear what you are looking for; the confusion is exacerbated by your own mixing up of the terms. So it sounds like you want to to do morning dress for the AM and evening dress for the post 6PM festivities? I assume from the difficulty you've had in finding what you have in mind that this is it, and that you don't want a tux. That's a bold move but I like it.
I'm kind of getting the feeling that price is no object, but are you interested in T&A (heh) because they seem to be the only game in town, or because they make shirts for Prince Charles and the rest of that kinda-charming-kinda-incestuous bunch? If the latter, more power to you, and if they can't do it, I am sure you can find someone else in your price range without issue. If it's strictly a "can't find it anywhere else else" issue though, it's possible!
CT Shirts of all places has a full morning kit, for a steal:
Men's Morning suits | Charles Tyrwhitt
www.charlestyrwhitt.com
I am a peasant and not some English royalty so don't quote me on this but AFAIK, the black jacket with formal striped trousers is considered a touch more formal than if the jacket were to match the trousers in a solid gray, like what Charles usually wears.
For the evening side, here's this number from our good friends at Hickey Freeman:
Black Tasmanian Full Dress TailsBLACK / 48 / Long
Web ID: 61398200B078 Our Black Tasmanian Full Dress Tails will transport you back in time to an era where White Tie Formal Attire was a sign of class and wealth. DETAILS [EXTENDABLE] Full Dress Tails Morning Coat, with Center Vent Peak Lapel, with Black Satin Facing 6 Satin-covered buttons...hickeyfreeman.com
All the classic details, Loro Piana fabric, and made by the good people of Hickey Freeman? ****, at that price, I'm tempted to get one for myself and just passive aggressively put it on every time my team has to work past 6PM.
For the rest (shirt, tie, shoes, evening pique vest) you can piece together from various vendors that I am seeing from a quick google search. LOLOL you can get the vest from JAB for $20. For a little garment where fit doesn't really matter? Why not.
I think what they're getting at is that people assume the order of quality, whatever quality means, is bespoke >> MTM >> RTW because of the price tiers, when all you are truly guaranteed going in is that that is the order in which the things cost to make; bespoke is made using the most inefficient way possible, while RTW is the opposite. Bespoke can theoretically incorporate nuances and details you cannot get via an RTW manufacturing process that streamlines away a lot of steps included in bespoke, but a bespoke tailor might not bother with all that, plus it also opens the door to all sorts of human error at each step of the way.
It's uncommon that a bespoke jacket is a total unwearable disaster, as that is what the multiple fittings are for, but it's also possible that the result is no different from an RTW garment that has had an alterations tailor dial it in for you. Worse case scenario, you are stuck with an unwearable garment and will have to eat the cost, or, just to rub salt into the wound, run out of time and have nothing at all by the day of the ceremony.
At the time of the original post, I wasn't sure what I was looking for either besides white tie. I was thinking of a tux for the afternoon so I have something more reusable from my wedding. However now I've decided to go morning dress and white tie with no tux because they complement each other better Price is an object though otherwise I'd be at Huntersman this weekend getting fitted . (I'm willing to pay around $5k per suit, not $12k being the starting price point)
I appreciate your findings on the budget options! Well done.