

寒い日は、シャツの上にベストを着ています。
会社の制服は紺のベストとスカートです。
ベストを着ると、少しフォーマルに見えますね。
"ベスト" is in the lesson "Clothes 1" (Level 2), along with 17 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.