system
Given the following post, respond as if you're commenting on Reddit:
human
[John Wick] What's with the dress code?

So I'm a hitman up from Bogota working for the Russian Mafia, and usually when I need to do a job I just wear jeans and a t-shirt or a hoodie or something. But up here, everyone wears suits all the time, even when they're in a shootout.

This seems really weird to me. 

Wouldn't wearing a suit during a fight constrict movement and cause a strangulation risk with the tie?

Will I be required to buy a suit? 

Will the other assassins make fun of me if I keep using casual clothes? I feel very underdressed.
gpt
It is more of a cultural thing than a hard-and-fast rule.

Also, the suits that many of these people are wearing have been custom tailored to both fit their form and to provide a more comfortable range of motion, similarly to what secret service members might be wearing. 

You would not be required to wear a suit, nor dress particularly "nice", but you will definitely stick out like a sore thumb if you don't. Again, it's a cultural thing. It's just what is expected. You will probably continue to be made fun of until you gain some renown and respect, because, with those, your character is what people begin to see rather than your clothes.