Let's talk about uniforms. Uniforms have several functions beyond keeping your backside from sticking to the furniture (though that may be the most important!)
Uniforms allow you to recognize a member of the service.
Uniforms provide some measure of protection.
Uniforms provide pockets.
Space Fleet uniforms are made of nonflammable material. The basic uniform onboard ship consists of a light blue coverall with green piping down the legs and boots (either high boots or ankle height). Sleeveless and legless green overalls are often worn over this.
The Space Fleet is fairly easy going regarding uniforms onboard ships and in transit. Small personal touches are allowed. In addition while the uniforms are designated male or fem crew are welcome to wear whichever version is more comfortable to them.
The basic uniform consists of a blue coverall and boots. The boots have ankle and shin reinforcements. The protection is not only good for using a lifter belt, it is helpful in low gravity maneuvering. Crew sometimes try 'stunts' to traverse several decks under low gravity levels and forget that while their weight is reduced their mass is the same and they can build up a good head of steam. Already ankle and leg injuries are down 40% in the Fleet with the use of this foot wear.
Unfortunately wrist and arm injuries are up 40%. The fleet is looking into wrist and elbow guards.
As you can see the uniforms *have* pockets. The pockets seal closed for zero gravity situations.
Branch is indicated by the collar and cuffs. The Space Fleet generally does not bother with rank insignia aboard ships. Rank badges are reserved for dress uniforms. Anyone transferring ships is advised to learn the hierarchy quickly.
The blue collars and cuffs mark these crew as Engineering. The Engineer on the left is further differentiated by the yellow tag on her collar and yellow striping in her hairband as dealing with airlocks and extravehicular activity.
The crew have hair at the maximum length allowed by regulations. This is for ease in donning spacesuits. Hair bands and scrunchies are required. If gravity goes out or a ship moves suddenly a crew might get hair whipping in their eyes during a crucial moment.
Engineers almost always wear specialized boots with reinforced steel toes just in case someone drops something heavy.
As a further note, most crew are allowed jewelry such as rings and chokers. Engineers are not due to safety concerns. electrocution and getting your necklace caught in machinery is never fashionable.
Officers have a white collar and cuffs. these officers have added over tunics to their basic uniform. this is pretty common. Engineering does not usually do this because the tunic gets in the way when crawling through machinery. The officer on the right is outfitted for a landing party with a compressor mask and eyescreen used for missions on Mars or a desert area. He's also wearing lifter breaches, similar to riding breaches with extra leg room for making jumps. The fem version of the tunic opens in the back and the make version on the side. Both tunics have straps running under the legs and arms that a lifter belt attaches to. They also have supplemental pockets. The officer on the left is wearing jewelry to give an idea of acceptable ornaments.
Some crew wear lifter belts onboard their ship to transit decks fairly quickly. Other just prefer wearing the tunics because the basic uniform feels like pajamas.
Billed cps are not used in the Fleet in general. Crew using billed caps have to turn the bills around to ascend ladders for safety reasons, the crew all carry goggles for eye protection and it's too easy to catch the bill on machinery in the engineering sections. Also if anything a space helmet can go over a sift cap in an emergency. You don't need to take it off.
Deckhands are designated with red collars and cuffs. They are usually relatively new to the Fleet and low ranking, Deckhands are extra crew carried in case personnel are incapacitated. Their major function is to handle damage control and first aid. When they aren't doing that they could be performing maintenance, swabbing decks or assisting personnel in almost any task. They also double as ship's troops. In some cases personnel remain deckhands after several years or for their whole career because they prefer the constantly changing duties. Highly experienced hands of this sort are prized.
This deckhand is wearing goggles with light enhancing lenses (like the engineers). Not everyone puts up with the added weight of the light enhancement gear and most goggles are not equipped.Almost everyone wears goggles onboard ship or has them handy. For one thing, low gravity plays hell with vision over long term exposure engorging and warping eyes. The goggles have an electro massage feature that alleviates this. Crew operating in the machine shop or laboratory may be exposed to metal filings or other contaminants and the goggles provide protection as well. Finally in the event of a micr meteor strike or combat it is possible for the inner hull to be breeched. Most breaches are a few centimeters across and will take several minutes (at least) for pressure to drop dangerously but winds from these hull can whip debris into eyes and blind unprotected crew at crucial moments.
Medical branch is designated by green collars and cuffs. This doctor replaced the over tunic with a smock and the lifter foot wear with comfortable ship shoes. She is clearly happy with a more sedentary set of duties.
Gunners are designated with yellow collars and cuffs. They also will wear their over tunics and lifter belts on duty. This is because reloads for the big guns can weigh over 100 kilos and lifter belts help enormously with reloading. Gunners are often the most adept crew at changing the lift settings on their belts to let them tote heavy loads. Sometimes they even use the winches set up for that purpose.
Warships seldom carry troops. They are simply not designed to move people in large numbers and the Fleet usually commandeers civilian liners or sleeper freighters for large troop movements. Special Forces are the exception to this. Special forces operate in small teams of two to five operatives. They are part of the Fleet by necessity, troops have to pitch in with the regular crew on a flight. In general they operate as deckhands, performing maintenance and aiding more skilled crew. Some Spectfor members wear mission badges on their caps. Others believe mission badges are bad luck or tempting fate. Badges record numbers in the same fashion as Roman numerals (| = X, / = V and o =I). Those officer has completed 16 missions (|/o = XVI). The uniform's tunic contains some armor, not enough to matter against modern weapons but able to stop clubs or a knife thrust.
In general uniforms are simply ignored unless you need a character sketch. You might consider using the gear worn when assessing saves. Perhaps using your lift belt to drop down the length of the ship is a dicey idea but you rightfully point out that you're wearing those lovely boots and deserve a +1. perhaps later you're trying to be stealthy and you hard soled reinforced boots give you a -1. In general things should even out and again the uniform pictures I posted are just for color, to develop a look for my world. though you might get into an argument with your CO over those mission badges you clipped to your cap.