衣 (yī) is a bound form (b.f.) that appears as a morpheme in compound nouns related to clothing — it is not a standalone verb meaning “to wear” (that usage belongs to the fourth-tone reading yì). You will encounter it in words like 上衣 (shàngyī, jacket), 内衣 (nèiyī, underwear), and 毛衣 (máoyī, sweater). The existing English gloss is misleading: treat 衣 as a noun-forming element, not a verb.