Where does “vestiarius” come from?

vestiarius (Latin) comes from Latin vestis, from Latin līnea, from Latin līnum, from Proto-Italic līnom, from Proto-Indo-European līnom — flax.

Ancestry of “vestiarius”, step by step

Step	Language	Word	Meaning
1	Latin	vestis	garment, gown, robe, vestment, clothing, vesture;...
2	Latin	līnea	—
3	Latin	līnum	—
4	Proto-Italic	līnom	—
5	Proto-Indo-European	līnom	flax