Actually, you don't necessary need to wear Diving Suit for TK or TX; many TK initially was or are still wearing
Polyester Lycra Bodysuit, similar to that of a full body Swimming Suit minus all the paddings, linings and extra seams for decoration purposes or ease of moving body parts when competing (
while swimming or surfing etc).
Locally, it can be done by the Dance Clothing Shop.
Even for Diving Suit, I'm sure those who live in the Tropical area know you're highly not recommended to use the Neopane (
aka Cold Water or Deep Diving?) kind.
Why Diving Suit is chosen is that it's thicker than the regular Lycra Bodysuit and it can be bought off the rack instead of tailored apart from not so shiny (
correct me here if I'm wrong 
)
For
Scout, yes, as Tham said; most of us had our Jumpsuits (
Cotton or Polyester-Viscose[?] blend) done locally by our "Imperial Tailor"
BUT at the current rate of orders from factories, shipyards, construction site etc she have to handle (
making our Jumpsuit, uniform etc is just her side-line job!), not recommended to place any "rush" orders till like
after CNY 
(
she say one, not me 
).
And there will always be the chance that you have to go for "fitting sessions" at least a week or even more apart even tho' the costume and parts had been completed as in her rush, she might make certain parts too big or too tight etc.
For Tailored Cummerbund and Pouches locally, so far got 2 recommendation:
The above said tailor OR another who had done at least 2 regular sets before this.
For the later, she is only a
regular tailor who have a good amount of experiences making costumes so you got to provide your own materials, references pictures, diagrams, templates and maybe even measurements, apart from be ready to face slight inaccuracy which she might or might not be able to fix to fit your desire.
Unless you got the money to spare and willing to "risk it" (
in term of fittings as you're only sending measurements which might not had been taken correctly), there are some people in US making excellent ones. Links had been provided at BSN Forum.
Local Imperial Tailor address will be given when you confirmed you're ready to get the parts done.
As for which armor is most comfortable in our weather, in a way it depend on how well ventilated your helmet is or how well the armor parts had been fitting/trimmed to your size and of course the weather.
ABS Armor are relatively light so it's the armor of choice unless in cases when it's not available like for certain "uncommon" armors.
Heck, TB Armor can still be a warmer costume to wear than TK if you go ahead and do it like me; I always wear a T-Shirt and maybe even Arm Warmer under my Jumpsuit (
force of habit and can't imagine how my jumpsuit will smell if I dun wear the T-Shirt). And my current TB Jumpsuit is Cotton Drill, the kind meant for pants.
Dun forget also for "Movie Accurate" TB, you are also wearing a Short-Sleeves Vest apart from the Cummerbund over your Jumpsuit so technically, it IS thicker than wearing TK (
Bodysuit & Armor).
Being made from Cotton doesn't necessarily means more cooler and Polyester these days dun necessary means no Air Circulation.
And FYI, we
DO NOT freely post the link to where we gotten our armors and helmets as they're unlicensed items, in order to "protect" our suppliers from bored LFL Lawyers. Link will be pass along when you confirmed taking up this project.
Just my 0.02
In addition, the experience/knowledge gained through in the process of building a TK and while trooping with others, would help in the building of a TB next. You get to enjoy trooping while at the same time take your time to build another outfit.