I'm dorkily keen on fashion and I think being able to imagine what people were wearing is a pre' important part of imagining the setting and stuff of... things
...screw introductions HEY GUYS I FOUND SOME COOL LINKS
Since the story sort of goes from the Regency to Georgian/Romantic eras, fashionwise, there's both this link here
, which is the former, and this one here
, which is the latter. The one becomes the other around the 1820s, so the latter part of the Regency section is actually more relevant to Les Mis than the beginning of the Romantic one, but it's cool to have a look at both.
OH AND here's some hairstyles and hats
(The second sets of examples obviously; the more ridiculous ones :'D)
And I've also found costumes.org to be an awesome resource, there's some good stuff in the 1830's section of the Victorian period page (here)
and in the Regency page (here)
I HOPE YOU ALL ENJOY THOSE, presuming you have not seen them all before; I'm going to go draw Cosette in a bunch of stupid hats now.