Viva, my BFs are also Gap - I have two, one in my usual size, and one in a size up. The pair in my usual size are quite big (although they don't photograph that way) and need a belt to hold them up. I tried them with my dressy booties today but didn't like that look. I think a rugged pair with a chunky heel is going on my wish list. The ones you showed from Zara look fantastic, I hope they work out!
Diana and Aquamarine, I was thinking the tall boots would create a jodhpur look, I'm not sure if I will like it, but I'll give it a try. It might work with my slimmer BF pair.
Tuile (and Una), do you let your long underwear show, or is it covered by socks/booties?
Suz, you're partially right - I'm too tall to unroll my BFs (they're Gap, not TR Cameron's) and have them be anywhere close to full length. I don't have the Cameron BFs, but I do have a lightweight pair of TR Brianna's, which (my pair anyway) is also a BF fit. They are very long at full length and I wear them unrolled in the summer. They're aqua and very lightweight, so definitely only a spring/summer jean.