This isn't about the stripes (which I think are fine), but it's an aesthetic/audio suggestion, so I guess I'll put it here.
I think Snake's taunts need some adjusting. "Not even close!" and "Colonel, mission accomplished!" are neat, but they're already victory taunts. It just seems kind of sloppy/lazy to have these re-used. Since "Not even close!" has a 50/50 chance of being "Tasty!", I'd say just leaving it as "tasty" would be cool (partially because that's already the lolziest taunt in the game). As for "mission accomplished", If it were just the Codec ring, I think it would serve the same purpose and wouldn't be a re-tread.
As for a possible new taunt/victory pose, I think it'd be cool to have Snake eating a snake with the "nom!" and "good!" sounds (even though it's a trait of MGS3 Snake, so is the knife). Also, Snake is notoriously a smoker, so I think it'd be in character to have a taunt/pose where he took a drag and then steps on it. At the very least, I think this should be an idle pose. I know things like these couldn't have been in Brawl because smoking's bad for kids, but since the knife made it in, I figure it's not too far off.