onesie

今日の単語も最近の若者文化についての記事 Everyone's a Star からです。
It's a community of peers, much like the underground press was in the 1970's, but without an editor. It's a free platform on which artists, actors, activists, the maker of cake pops and the knitters of onesies can exhibit their.
"onesies" が知らない単語ですが、"knitters of" とあるので、衣類だろうと予想できます。ワンピースの一種でしょうか？　辞書を見ます。
・Wiktionary:
1. (US) A one-piece garment for an infant or small child, generally worn over a diaper.
2. One-piece adult loungewear jumpsuit.
3. One-piece fashionable streetwear worn mostly by teenagers.
・Wikipedia: An infant bodysuit is a garment designed to be worn by infants much like a T-shirt; they are distinguished from T-shirts by an extension below the waist, with snaps or Velcro that allow it to be closed over the crotch. The purpose of the opening at the crotch is to facilitate access to the infant's diaper. Like T-shirts, infant bodysuits come in a wide variety of designs and may be worn as undergarments or as outer shirts. Other names include Onesies (a registered trademark often used in the United States as if it were generic; see below), creepers, diaper shirts, babygro, babygrow, mameluco or snapsuits.
記事中の "onesies" は恐らくWiktionaryの3番目の意味で使われていると思いますが、商標の "Onesiesonesies" はあれの事かと想像できました。