。
Japanese clothing suits her better.
Literal
She [topic-は] Japanese-clothing [possessive-の] [alternative-方が] well suits.
The 方が (ほうが) comparison pattern appears here without an explicit 'than X' — the comparison target (presumably Western clothing) is implied. 似合う (にあう, 'to suit/look good on') is the standard verb for how clothing or styles look on someone. This is a natural way Japanese speakers express preference without stating both options.