This meme is funny but they are pretty similar. The only "gear" Yejin is wearing is the shooting glasses, which is basically a prescription lens (no magnification is allowed - these lens make things look less blurry, but can't make them look bigger) on a frame that allows more adjustment than normal eyeglasses, with a piece of plastic instead of lens over the other eye. You can achieve something very similar by taping a piece of paper to the left lens of your own glasses.

The advantage shooting glasses provide is the ability to move the lens up/down/sideways. Depending on your specific shooting stance, if your head is tilted too much, normal eyeglasses may not provide the best field of view if you're only looking through one side of it. In those cases, you buy a pair of shooting glasses and move the lens. If you look at Yejin's shooting stance, her arm is almost parallel with her body, whereas Dikec's arm is slightly angled forwards (not much, maybe 10 degrees?). This means Dikec can see more out of his regular eyeglasses than Yejin can in their respective shooting stances, which is probably why Dikec didn't need shooting glasses.

Besides ear protection (which Dikec is actually wearing - if you watch videos of the match he has bright yellow earplugs in), no other gear is allowed in this event - shoes cannot go above the ankle, clothing cannot restrict movement. Most people wear some sort of flat-soled shoes, whatever clothing you wear literally doesn't matter except to keep you warm/cool. This is in contrast to air rifle, where stiff clothing is allowed - competitors basically wear what looks like clunky armor (https://upload.wikimedia.org/wikipedia/commons/f/fd/Air-rifle-shooting.jpg), it's hard to bend your knees in them and nearly impossible to squat. I used to train with those guys, I'd take the piss out of them by pretending to be nice and offering them some water, then putting it on the floor in front of them.

And before anyone mentions it, putting their hand in the pocket is the standard stance for air pistol shooting. Only one hand is allowed on the gun. And in a sport where your breathing and heart rate interferes with your accuracy, having one hand free means it might move around and cause micro movements to your body, so everyone puts their other hand in their jacket/pants pocket, or tucks the thumb in their waistband.

It does look badass though.

Source: I used to compete in ISSF 10m and 25m air pistol events like these (this is 10m)

FINAL EDIT: I just wanted to end by saying that Dikec (the Turkish guy) may look cool and casual, and I enjoy all the "retired hitman rolls out of bed casually" memes just as much as everyone, but don't let that diminish the decades of training and dedication he's put into the sport. Dude has been competing for more than 20 years and first set a world record in a different shooting event in 2006. Shooting is one sport where age isn't a big disadvantage.