Avery Byrd, also known as acdramon, likes to take existing costumes and put his own variant spin on them. He did this with his armored Batman Beyond suit. He started with paper templates and then used EVA foam — it might be gym mats — to craft his Bat-suit (you can see in progress photos below). He painted and weathered every piece of the armor and made batarangs to go with it. The finished ensemble is clearly tied to Batman while being unique.
You can see more pics of Avery’s work at Facebook.