"The original post suggested his tent didn't have a vestibule"
The tent in question is the TT Scarp 1 , one of the few singles to have TWO vestibules...
If you look at my picture, the "clothes line would be hanging on the outside of the inner (folded in so that you can see the set up...)
Obviously for anything to happen you need some air movement, a still rainy night is not going to dry those bits apart from the drip/dry bit. Still, better than nothing.
Franco