When it comes to choosing bikinis for a short torso, there are a few key styles that can help to elongate the appearance of the torso:

1. High-waisted bikinis: These bikinis have a higher rise on the bottom and sit at the natural waistline, which can create the illusion of longer legs and a longer torso.
2. Triangle tops with adjustable straps: These tops have adjustable straps that can be lengthened to create a longer appearance, and the triangular shape can also help to elongate the torso.
3. Halter tops: Halter tops have straps that tie behind the neck, which can help to draw attention upward and create the illusion of a longer torso.