IPA: /ˈɪntərˌfeɪsɪŋ/
KK: /ˈɪntərˌfeɪsɪŋ/
A material used in sewing that is placed between layers of fabric to make them thicker or to help them keep their shape.
The tailor used interfacing to give the collar a more structured look.
Interfacing → It is formed from "inter-" (meaning between) and "face" (from Latin "facies", meaning appearance or surface) and the suffix "-ing" (indicating the action or process). The word "interfacing" refers to the process of connecting or interacting between two surfaces or systems.
Think of things that connect 'between' ('inter-') different 'surfaces' ('face') — that's what interfacing means.