。
My mother made me a white outfit.
Literal
Mother [topic-は] me [for-に] white clothes [object-を] made-[benefactive-てくれた]
白い服 ('white clothes/outfit') — 服 is the broad term for any kind of clothing, distinct from 洋服 (Western-style clothes) or 着物 (traditional Japanese garment). 作ってくれた pairs the verb 作る ('make') with the benefactive ~てくれる, marking the action as done for the speaker's benefit. The に on 私に marks the beneficiary.