I'm looking for a short-sleeved, lightweight "t-shirt cardigan." I have been searching all afternoon online and I can't find exactly what I want. This
comes closest, but it has stretch (too hot) and seems a touch too long.
Basically I want a slightly longer than hip-length t-shirt that buttons all the way up that I can wear like a cardigan over summertime tops and dresses. I don't want a sweater of any kind.
No cashmere, no pointelle, no crochet. 100% cotton, as lightweight as possible. Not cropped. No shrugs or boleros. I've looked at every clothing (high end, low end, juniors, misses, etc) website I can think of, and nothing. Everything that is vaguely related is either too frumpy, or too teenage.
(I've been thinking of commissioning a sewing friend or Etsy to make a t-shirt into a cardigan for me, but I'm not sure if the proportions would be right.) Any guidance would be appreciated - maybe I'm searching for something that seems like it should exist but doesn't.