Less than 20% of sustainable brands carry above-average sizing -- Reformation launched expanded sizing in select pieces in 2018. Meanwhile, Fashion Nova, Forever21 and Boohoo make up 39%, 12% and 10% of the plus-size market, respectively. Fast-fashion brands including Asos, Pretty Little Thing and H&M have also launched size-inclusive collections.

From the “Green Card Lottery” military jacket to tie-dye shirts indicating “the emotional unrest visa issues can bring,”  Poulsen’s brand marries minimalist streetwear and politics. Using muted tones inspired by her own Employment Authorization ID, she places the brand's logo “on the heart, present, heavy and jarring.” The backs of...