If you like the idea of Ventile – basically a very closely woven cotton – take a look at a Swedish company called Fjällräven. They use something called G1000, a heavy-duty, closely woven Polyester cotton with a wax sort of proofing that you can add to or remove depending on your preferences.
It’s lighter than Ventile, but has a similar sort of vibe to it and Fjällräven is a genuine outdoors brand with less of a fashion sort of vibe than Howies.
Can’t you get ventile reproofing liquid?
It doesn’t need reproofing as it’s not proofed to start off with – it works by the threads absorbing moisture and swelling which closes any gaps and prevents more water ingress, which is why it gets heavier when wet, but Nikwax does Cotton Proof – I guess if that stopped the fibres swelling up, it might actually make Ventile less waterproof though…