Where does “sweterek” come from?

sweterek (Polish) comes from Polish sweter, from English sweater, from Middle English swetere, from Middle English -ere, from Old English -ere, from Proto-West Germanic -ārī, from Proto-Germanic -ārijaz, from Latin -ārius — Forms relational adjectives to nouns (and rarely numerals).

Ancestry of “sweterek”, step by step

StepLanguageWordMeaning
1Polishswetersweater, pullover, jersey, jumper
2EnglishsweaterA knitted jacket or jersey, usually of thick...
3Middle Englishswetereone who sweat#Verb
4Middle English-ereer
5Old English-eremasculine agent suffix, originally applied only...
6Proto-West Germanic-ārī-er
7Proto-Germanic-ārijaz-er
8Latin-āriuser
9Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)
Every word from Proto-Italic *-āziosEvery word from Latin -āriusEvery word from Middle English -ere