It's not wrong, but I don't know how helpful it is. I think it could be helpful for identifying complimentary colors, but it's missing some context about which articles of clothing are which colors.
For example, it lists pink as a matching color for light blue. IMO, light blue pants with a pink shirt works fine, but a light blue shirt wouldn't work so well with pink pants. In general you'd want your pants a darker color or cooler tone than your shirt.
I'm not much help on the specific question, but I hate to have it die on the vine. So, I'll offer what advice I have.
I know a couple of people who shop at DXL and I've heard them recommend it to others, so I'd check with what they're offering. The guys that I know that shop there dress well.
The other place I'd look is Bonobos. They've got a wider selection of sizes than most retailers and I've been happy with everything I've bought from them.