Bullet Bra is a full-support bra with cups in the shape of a paraboloid with its axis perpendicular to the breast. The bullet bra usually features concentric circles or spirals of decorative stitching centred on the nipples.
Invented in the late-1940s, they became popular in the 1950s, and worn by the Sweater Girl, a busty and wholesome “girl next door” whose tight-fitting outergarments accentuated her artificially enhanced curves.
These photos show young women, mostly Hollywood actresses, who worn bullet bras from between 1940s and 1950s.
Here’s what Wikipedia has to say regarding the Bullet bra’s history:
Military terminology crept into product marketing, as represented by the highly structured, conically pointed Torpedo or Bullet bra, designed for “maximum projection”. The bullet bra was worn by the Sweater Girl, a busty and wholesome “girl next door” whose tight-fitting outer garments accentuated her artificially enhanced curves.