Inky. I have thin, fine hair too. It's a nightmare! There are so many styles I have to say no to.
Can't have a crop, because, not to put too fine a point on it, my scalp will show through. Can't grow it long, because it gets very straggly after collar length. Can't perm it - my hair is too weak. Can't have too many layers or a big fringe because, again, not enough hair. Can't wash it more than twice a week, even with frequent wash products, otherwise it dries out and breaks. Can't blow dry it daily, for the same reason.
Every single time I go ANY hairdresser, they recomment the same b*** thing - a nice geometric bob. I know it's sensible and it looks reasonably good, but I am so fed up with this style.
I tend to settle for bob variations. Right now I sport a long bob, with a few layors in it, and a tiny wispy fringe to soften my face. Wierdly, I have found that the shorter the bob, the thinner and more unruly my hair gets. When I blow dry it, one side sticks out and one side sticks in. A longer bob - collar length - works better because the increased weight of my hair makes both sides hang down straighter.
I have given up expecting my hair to look OK every day. So on bad hair days I wear small metal clips in my hair when indoors - discreet black ones, not those IMO(!) lairy teenage ones from Claire's Accessories and the like. Very useful they are, too. I'd highly recommmend them for fine hair. Outdoors on bad hair days I wear scarves and hats. My hair is almost long enough to tie back in a ponytail, so I may soon do this too.
I do dye may hair, but only as infrequently as I can get away with. Hairdressers have said to me, and I agree, with hair like mine, the less you can do to it, the better. That's why I'm very careful about not overwashing it.
As for products, I use the Charles Worthington Big Hair range. It's the best I've tried for ages. I'd particulalry recommend their Big Hair styling spray, used after washing and before blow drying. It certainly thickens my hair and definitely stops it looking outrageously thin.
However, it is not perfect. Thickness brings a degree of frizz. Currently I am after a sleeker style that kinks out at the ends of my layors. I am investigating hair serums etc so will read any messages on this with great interest.
HTH Inky - goodness! didn't mean to write so much!