

Why: hard to wear a bra, which means tits creep out at the sides.
or
Why: thinness of straps enhances size of shoulders and tits.


Why: makes the neck long and elegant, rather than bunching boobs up to the chin.

Why: pulls in the waist and divides and separates the bust.
alternative
Why: hides tummy; gathered fabric helps to dwarf size of chest and prevents tit-clinging.