пярэсты

Сognate with Ukrainian пері́стий (perístyj, “variegated”), Czech peřestý (“variegated”). Maybe:

• From Proto-Slavic *pьstrъ with metathesis (in which case cognate with Russian пёстрый (pjóstryj)).
• From Proto-Slavic *perestъ (“feathered; variegated”), from *pero (“feather”) +‎ *-estъ. But this suffix is rare/unusual (cp. *-itъ/*-istъ, *-atъ/*-astъ in Upper Sorbian pjeraty, pjerity, Ukrainian перна́тий (pernátyj), пір'я́стий (pirʺjástyj, “feathered”), пери́стий (perýstyj, “feathered; variegated”)).

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пярэ́сты • (pjarésty)

1. variegated

• “пярэсты” in Belarusian–Russian dictionaries and Belarusian dictionaries at slounik.org
• Oleg Trubachyov (1974) “Наблюдения по этимологии лексических локализмов (славянские этимологии 48—52). 51. Праслав. диал. *perestъjь”, in Этимология 1972, Moscow, page 33
• Chernykh, P. Ja. (1993) “перо”, in Историко-этимологический словарь русского языка [Historical-Etymological Dictionary of the Russian Language] (in Russian), 3rd edition, volume 2 (панцирь – ящур), Moscow: Russian Lang., →ISBN, page 23
• Melnychuk, O. S., editor (1982–2012), “перістий”, in Етимологічний словник української мови [Etymological Dictionary of the Ukrainian Language] (in Ukrainian), Kyiv: Naukova Dumka