Luxire, if you let me know what measurements you want I'd be happy to measure the collar of the mercer buttondown shirt I have.
The copper chino is a different color from the pants in that picture - maybe a bit darker and less yellow? As far as weight goes, 250g is much lighter than 17oz (17oz is 480g), so if you're after that maybe you'd be better off with something like the Khaki heavy twill or moleskin?
I'm getting the pants back from the alterations tailor on Saturday, so won't be able to post pictures until then.
I'll think it through.
I'm really looking forward to these photos. Saturday it is