Where does “ырбаахы” come from?

ырбаахы (Yakut) comes from Russian руба́шка, from Russian -ка, from Proto-Slavic -ьka, from Proto-Balto-Slavic -ikaʔ, from Proto-Indo-European -ikeh₂.

ырбаахы (Yakut): (for men) a shirt

Definitions

(for men) a shirt

Ancestry of “ырбаахы”, step by step

Step	Language	Word	Meaning
1	Russian	руба́шка	button-up shirt
2	Russian	-ка	now, just
3	Proto-Slavic	-ьka	—
4	Proto-Balto-Slavic	-ikaʔ	—
5	Proto-Indo-European	-ikeh₂	—

Every word from Proto-Indo-European -ikeh₂ →Every word from Russian -ка →Every word from Proto-Slavic -ьka →