The suit clearly does not fit him.

You and I remember this film very differently. I could swear it was excellently tailored suit in a number of really close up shots, early in the film. To the point where I thought the film was telling me

A lie that Memento seemed to be telling the audience

“This is absolutely his suit. Look how well it fits. Look how expensive it is. There’s no way that what is happening here is as simple as he took this off of a dead mobster.”

That suit had absolutely been tailored to his body. I understand that actors want to look great, and so I figure they let him wear a suit that fit for most of the film.

After the reveal

Memento Spoiler

that it’s not his suit,

they do have some lines about it not fitting, which felt very dishonest, after the earlier close-ups.

I would have been satisfied with a throw away line of dialogue about the suit not fitting before the reveal. I would have laughed at it (the suit clearly fits great in almost every scene), but it at least would have made the reveal cool instead of silly.

I would have also settled for (and I expected) a scene where he gets the suit trailored properly. But if I recall, there was no reasonable way to fit such a scene. Which I get. I’m not saying this film would have been better by addressing my pedantic complaint.

I’m not really mad that actors get to wear clothes that fit - it was just a stand out moment in an otherwise seamless (pun absolutely intended) film.