And all hats include antennae.
-which is disturbingly plausible.
All forms of written/printed information is on transparent material, or “clear paper”.
In the far future. In the near future, however . . .
David Szondy’s Tales of Future Past website would be highly appropriate here, but something seems to have gone wrong with it. 
The Atomic Rockets (Project Rho) site also has a lot of retro stuff, especially old pulp-SF magazine illustrations from the Space Opera days.
People will be having tons and tons of free sex, or none at all.
A lesson from Skinamax films: if you are female and you need to raise some money, whether it’s a quarter of a million dollars or just a couple of hundred bucks, getting your friends together and putting on a bikini carwash over the weekend will do the trick.
Another gem from Skinamax: in the far distant future there will be surprisingly large numbers of alien humanoid societies composed only of women. Women who will be at first threatened when they visit Earth and rediscover men, but then DELIGHTED when the men introduce them to heterosexual intercourse.
Along with everyone, or at least most people, being white and those who aren’t will be in the background and are expendable while most of the important jobs or roles go to White people. There are others that are aliens but with cultures coincidently like either noble savages or other stereotypical cultures.
So, more or less like today, eh?
I know this is not in reference to a book but there were scripts that these rules evolved from…
I used to make costumes for Stargate SG-1 and was told in no uncertain terms that
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There is no top stitching in space.
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Lace up shoes are never to be used for aliens …although the entirety of the rest of their costume may be laced up.
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There is some sort of wrist problem with most aliens that require them to have leather wrist guards (usually laced up)
If we go by Norman Spinrad’s Bug Jack Barron, all the blacks in the US will be exiled to Mississippi.
Camping headlamps will have been inexplicably replaced by flashlights that you hold in one hand, so that when you beam down into a dark place you only have one hand free.
Guns that have absolutely no recoil whatsoever will still be treated like pistols, firing one burst not very accurately, rather than just pointing a beam and sweeping it back and forth, like a flashlight.
Humanity’s last desperate hope will be young, good-looking and kinda stupid.
Unless there’s an opportunity to tell the puny humans they have 30 of their Earth seconds to live.
But only if the Earth computers are made by Apple and run System 9. Hmmm. System 9 From Outer Space. It might just work.
Reflective knits!
Reflective full-body S&M leather fetish outfits. Jeez, people!
Now we’re cooking with plasma!
Except, of course, no one cooks. Everyone will eat small, polygonal, bright chunks of primary-coloured bricks. Not reflective so no one eats your earrings.
Forget lights, I’d guess that within fifty years if not sooner multispectrum, low-light vision augmentation glasses will be as ubiquitous as sunglasses are now.
As for beam weapons, it’s actually more plausible that they’ll fire in bursts, to conserve power and to keep from overheating. As it is machine guns can burn out their barrel if you try to use them as a bullet hose.
Just like anime, every freaking time (not every time, but you know what I mean.)