Thanks to everyone who weighed in on this question.

Keeping in mind your suggestions (crossover blouse, avoid knits, longer length), I found this Vince Camuto blouse: http://shop.nordstrom.com/s/vi.....se/3658461 that seems perfect.

It also comes in black, but my sister is a blue-eyed blonde so I'm kind of leaning toward this Gardenia color. (Similar to Pantone's "Radiant Orchid" color of the year, no?)