pantsless

The story

1. Proto-Indo-European*peh₂-
2. Proto-Indo-European*ph₂énts?
3. Proto-Hellenic*pánts
4. Ancient Greekπᾶς (pâs)
5. Ancient Greekἐλεήμων (eleḗmōn)
6. Ancient GreekΠαντελεήμων (Panteleḗmōn)
7. ItalianPantalone
8. Frenchpantalon
9. Englishpantaloon
10. Englishpantaloons
11. Englishpants
12. Proto-Indo-European*lewh₁-
13. Proto-Indo-European*lewHs-
14. Proto-Germanic*leusaną
15. Proto-Germanic*lausaz
16. English todaypantsless

From pants + -less.