Idea of Bulletproof Vest Icon
It is like a shirt, but sleeveless. There is a big square in the middle that is presumably for the armor part of the vest, and it takes up much of the "stomach" area. Both sides have two sets of small squares that are aligned on top of one another on either side of the vest.
This Bulletproof Vest icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,100 icons, all in the same style and quality.