Aha, I see where the confusion is. The white part you've circled is actually the pointyish tops of the bicep armor itself. The black stripe underneath isn't the undersuit--it's the elastic, overlapping the bicep armor.
Just wanted to link my build thread at MEPD for future reference. My forearms turned out just fine, barely, after I trimmed off all the formed ridges, since I used a heat gun to bend it inwards more. Can't wait to see how you managed it.
Would love to hear more about how you managed to get the forearms smaller... Like Diana said, shortening them seems pretty simple, but getting them narrower looks way more tricky.
For my sound system I'm probably going to get an Aker amp, and love the simplicity of the iComm... But does anyone have advice or ideas on an affordable voice changer so I sound more like a dude? Or is that the sort of component that would put me way overbudget?
Here's the list of approved armor makers:
The various types of armor and where to find them
I've actually been compiling a list of good comebacks to the "aren't you a little short" line, haha.