Unfortunately they copy & paste that "selvedge coin pocket" phrase so it appears on almost every jeans listing regardless of whether they're selvedge or not. But in this case I think you're right & they may be selvedge.
It's brown with a green tint, the weft is olive green:https://instagram.com/p/48tSSsq7Wj/?taken-by=subs0undhttps://instagram.com/p/48tWVhK7Wl/?taken-by=subs0undEdit: Oops, these are the dusty olive wash, not dusty brown. I think you were after the beige jeans , but your link no longer works.
No it's called the Indigo-dyed striped workshirt. Yes I know they are difficult to tell what you'll get. The descriptions are also often incomplete.http://m.ralphlauren.com.au/en/men/rrl/shirts-13/indigo-dyed-striped-workshirt-623305/646712?country=AU¤cy=AUD
X-post from my IG: Tulare workshirt (not sold on the US website but available on AU website now with different name). One of the nicest shirt fabrics I've seen from RRL: heavyweight, indigo dyed and antique beige stripe selvedge.
Looking forward to it. Agree with the other two suggestions; some more workshirt ideas: A hemp or sugarcane blend, stifel print, jaspe, antique woven stripes, anything textured or unusual & of course denim. Colors: indigo, olive, charcoal, grey, black. Heavy, rigid preferred. The shirt details I think you've nailed.