ベスト

べすと
noun
vest; best
1. vest; waistcoat
A sleeveless garment worn over a shirt, typically as part of formal attire or for warmth.
Wear a vest with a suit.
I'm wearing a down vest because it's cold.
Knit vests are handy items for spring and fall.
2. best; one's best
The most excellent or favorable outcome; doing one's utmost.
ベスト()くします
I will do my best.
I think this is the best method.
I set a new personal best in the marathon.

ベスト has two distinct meanings as a loanword:

1. CLOTHING (from English 'vest'):

Types

Common collocations

2. EXCELLENCE (from English 'best'):

Common expressions

Note: In British English, 'vest' means undershirt, but in Japanese ベスト refers to what Americans call a vest (British: waistcoat).