Look, I like the movie too, but y’all are seeing things.
The hat in Hitman is not a bucket hat, it’s a fedora. Completely different, and even the color looks more yellow than tan, though the lighting makes it hard to tell.
He’s not wearing a watch, and he’s also not wearing their sunglasses, which are also a different make/ brand.
The only large-scale item of clothing that is similar is the shirt, but I get the sense they went with “tourist shirt with flowers on it”, rather than it being a specific reference to Hitman. It’s a very common trope after all, and tourist clothes are certainly not unique to Hitman.
It’s also a different cut of shirt too (note the collar width’s); 47 shirt is tight and fits his body; the Killers is hanging out and looks less professional, which is intentional in their part; as I recall, the entire getup is based on some tourists he met when in a country so he comes off as non-descript as possible.
By your logic, 47’s Summer Suave suit is in reference to the Color of Magic as they wear similar getups, when again, they’re not all that similar. Same function, similar designs and clothing slots, but not the same because the clothing and designs are by-and-large too disparate from one another, not to count as an homage. Ergo, not proof that one work is homaging another.
If you wanna look for references, consider the Arkian Tuxedo:
Now this is in reference to Eyes Wide Shut, the mask is very clearly more than a little inspired by the unique butterfly-esque mask Bill(?) wears in that film. In fact, most of the masks on Sgail are patterned, or at the very least, heavily inspired by, what you see in the film. The film has a distinct style and theme that IO is copying; subtle enough for those in the know, but not enough to call attention to it. That’s what makes an effective Homage; distinct elements being translated from one work to another.
By comparison, the Killers’s getup is not unique, nor is it really all that notable. It’s non-descript cheap tourist clothes chosen deliberately to throw pursuers off. 47’s getup meanwhile shows he means business and doesn’t really have the same fashion connotations.
47 is James Bond in-game; he likes what he wears and wants everyone to know it. The Killer, from what we see, is actually trying to be covert.
TLDR; Not everything is a reference, homage, or wink to another franchise.
Also, I wrote my thoughts on The Killer here, if you’re at all interested @Franky.K