The word 'wearer' is a transparent English agent noun formed from the verb 'wear' and the suffix '-er'. The verb 'wear' itself has deep Germanic roots, originating from the Old English werian, meaning "to clothe, put on, carry, use", which is related to Old Norse verja and Gothic wasjan. The agent suffix '-er' descends from the Old English -ere, a common Germanic formative used to denote a person associated with an action, akin to the Latin '-ator'. The logical construction is perfectly literal: a 'wearer' is simply "one who wears". This straightforward compounding reflects the highly productive nature of the '-er' suffix in English for creating nouns that identify a person by their characteristic action.

Structure: wear (to have on the body) + er (one who does) - wear: From Old English werian, meaning "to clothe, put on, carry, use". It functions as the verb root. - er: From Old English -ere, an agent noun suffix denoting "one who does or is associated with". It functions as a derivational suffix forming a noun.