Where does “бельишко” come from?

бельишко (Russian) comes from Russian бельё, from Russian бе́лый, from Proto-Slavic bělъ, from Proto-Indo-European bʰēlHs — white surface or stain.

Ancestry of “бельишко”, step by step

StepLanguageWordMeaning
1Russianбельёunderwear, skivvies, underclothes, undergarment, undies
2Russianбе́лыйwhite, light
3Proto-Slavicbělъwhite
4Proto-Indo-EuropeanbʰēlHswhite surface or stain
Every word from Proto-Indo-European bʰēlHs →Every word from Proto-Slavic bělъ →Every word from Russian бе́лый →