The straps around the leg and chest I think should be at least a slightly darker brown, but not too dark. As for the top if your using dyelite use this color code; B5794E, That's what I used to get mine. Lower the error rate down to 6-7 and flip the number of outcomes to 2, You'll be able to have a 2/5 chance at it. Most of them as I've seen turn out very well when it comes to the top. There's a rare case you'll get a more orangey color. In which case try to avoid it. it just looks way to odd to be the color of the top. Hope this helped. :3 Below is the image of my dyelite in case your better off just visually seeing it.
And I've also seen different variations of the pants. Some do a slightly off white to capture Eren's pants color and some a greenish hued white. I personally think the white pants just makes it look a lot cleaner.
This is also what my straps look like up close if you wanted a bit more of a idea I just used a medium dark brown I found in some Kiosk for like 20k. (Lucky me)
Mabinogi Status