Before i had any nice and very light and packable down quilts, i decided to try out my wife's bag booster, which i had made. It is two silk mummy liners sewn together with a 5x3 layer of 2.5 oz Apex sandwiched in the top between the silk (the apex was a left over piece).
That and a lightweight down jacket is all i had for insulation besides my normal clothes. Decided to do this in late winter, and slept in an AT shelter.
Well, it got pretty windy that night and that shelter didn't help much at all with that, in fact i think it focused the wind and made it worse.
I wasn't scared for my life cold, but i certainly didn't sleep fully comfortably by any means. If the silk had been less breathable, would have been warmer. It was mainly the wind that was the problem. If it had been a still, calm night, i would have been comfortable.
Yup, stupid light. I could have brought my S.D. Zissou 30* Lite bag, but since i was excited to try out my new S2S Ultra sil day pack, decided i could forgo the real insulation. (roll eyes at self). Had i had my EE 40 degree quilt back then, i could have had both the light, small pack and the warmth. So maybe it's more of a case of "stupid wallet"..