In fact, I wore it in a bun here and here. I feel as popular as they are, it's really tough to make it look "naturally messy," like I didn't spend 20 minutes doing this, I just threw it up and viola, messy bun.
This method may not work for everyone, but it's what worked for me. I actually use a rubber band for two reasons. my hair is incredibly thick, and no other hair thing can handle the thickness. But I wouldn't recommend using rubber bands if your hair is delicate. This tutorial will actually be probably backwards for most of you, if you're a lefty like me (yay) this will be correct, however if you're a righty...reverse your hands. I also put my hair up in a bun standing up and upside at first, I can't do it any other way.
A messy bun actually works best with hair that hasn't just been washed. So if I washed my hair Sunday, and it's Tuesday, that's prime time for a bun.
find someone to take pictures for this post :P
standing up and bending over, gather all of your hair into one hand and then flip your hair to one side. Depending on what side you want the bun on, put your hair on the opposite side. I'm telling you no matter how many times I've tried I can never get my bun to be dead center, no matter how many times I try. So if I want my bun to be on the left side, I have my hair hanging to the right side.
I tried to do this exact same thing with freshly washed hair, no good. so if you're doing this with freshly washed hair, instead of collecting all your hair upside down, sit and pull your hair up into a "pony tail" so that it's not all smooth and it's kind of raked up to create the illusion that it's messier than it really is.
using your left hand to hold the hair, use your right hand to pull about 1/2 of your hair into the pony tail and leaving the rest out. Depending on how you pulled it in, the hair that's hanging out may be on the left side now. That's fine.
Using the hair that's hanging out, twist or tuck under the elastic. This gives it the illusion of a messier bun.
make your husband take a pic to show off your skills!