。
She put on a red blouse.
Literal
She [topic-は] red blouse [object-を] wore.
ブラウス is a loanword from English 'blouse.' 着た (きた) is the simple past of 着る — she put it on as a completed action, as opposed to 着ていた (was wearing, ongoing state). The difference between 着た ('put on') and 着ていた ('was wearing') parallels English but Japanese makes the distinction clearer through the ている/た contrast.