The lighter the color, the worse the stains will get. Your suit will look like it has a bunch of rust stains and oil marks in these areas. It will look great the first time you try it on. However, the more you dive it, the more it will get stains on it. Black hides the best.
My black & purple still looks OK, but it's only had around 20 or so dives on it. Heck, even my black/black drysuit is showing some colors from wrecks, but it's not as nasty looking as the black/yellow suit was. I was game to keep diving it, but it started to delaminate in Bonaire so I tossed it. Sniff.
Caetllonn: here's a suggestion: if they're making you one or more custom suits, ask 'em if they'll do a custom beanie. Find one that fits you nicely, then let 'em use it for a pattern. When I had my suits done, I also had 'em make hooded vests to go with 'em, but that was a disaster. The suit fit was OK, but both of the hooded vests were unuseable (one way too big, one too small). You won't have that kind of issue with a beanie.
And since you're scrawny like me
, the quote from Perrone is true. It's amazing when you finally get a BC that fits right. The rental ones fit me like I was a kid wearing my dad's jacket.