I forgot my hat

Forgot mine too.
There's your answer. There was less today, although still a substantial body of orangeness but a lot of people didn't bring their hats with them - having had over 3000 available for the Wycombe game, we'd foolishly assumed that would be more than enough to cover both games, but didn't anticipate the sheer scale of the demand on Boxing Day, so only had a few hundred left today (which went within minutes). There was no way, with only three working days between the two games, we could have restocked and in any case, we've cleaned out at least one major supplier. Apparently in normal circumstances they reckon having 2000 bright orange beanies and 2500 orange baseball caps in stock is usually more than enough to see them through!
But then having given out over 4000 hats in the first two games, we are slightly relying on people to keep on bringing them back, and bring their own orange stuff as well, so the thing keeps growing.
One thing I did notice a lot of today was people wearing non-hat orange things, e.g. t-shirts, little ribbons etc which I think a lot of people who just think the hats look damn silly are choosing to do. Which is great, Rob's whole idea was that people would find their own ways of expressing it, but clearly isn't as visible when you look across the stands as the bright orange beanies. So I'd guess there's a lot more orange out there than it looks like (if you see what I mean). But even on a slightly less visual showing than the Wycombe game, there's still many times more people wearing orange whether hats, t-shirts, ribbons ties or what have you than we dared hope for at this stage.
So, keep on going, keep wearing orange and Yeovil, just tie your hat to your wrist on the morning of the game, that way you won't forget it!