Seriously, then you have to go through the trouble of wasting a bullet for the guy, and you get blood all over your brand new suit. Inconsiderate people nowadays.
No no no no. You don't waste a guy who owes you money, then you'll never get the money and be out by the cost of the bullet. And yes, dry cleaners are expensive if you're wearing a proper Italian suit. You make the guy work for you. Say you have a little something that needs to be picked up and maybe delivered, you get him on it, nothing expensive, just a little something, maybe something for your lady, but you gotta remember to escalate your threats. If he owes money, he had some, bought something with it and wasted it, you be sure to break something personal of his, if you catch my drift? If he's a pianist, don't break his fingers or he he'll never get the money to repay you. If he's a dancer, don't break his legs, but threaten him and and break something else. If he's a no good low life scum with no skill or talent. Give him a six-gun, send him to a rival mafioso and tell him to shoot someone high profile, making it sound like a promotion to him of course. Make sure to inform him to say that a 3rd mafioso sends his regards, he doesn't need to know who he's really working for.