Noop Sceck

For girls with my pear bodyshape Trinny and Susannah recommend a scoop neck top with cut-away sleeves:

Here's a New Zealand designed alternative:
MicroModal Slim Fit Sleeveless Crewneck Top for NZ$140
For that sort of price however a cashmere v-neck to wear over button ups in my office with extra high ac is more of a priority.