I’m not aure if these are real, or if a fan made them but I found [this].
EDIT: They’re real. 🙂
We are SOOO STOKED to announce that we (finally!) have MERCH ONLINE!! Click here [http://www.districtlines.com/heiswe] to check out designs made exclusively by our fans…and maybe wear one! Also, when you buy one..make sure you EMAIL US [heiswefans@gmail.com] so we can give you a sneak peak of a song from our EP coming out! And as always, we love you (whether you wear our shirts or not). Love, rachel and trevor.
He is We Fansite 
They’re real. HIW just posted on Facebook about the site