Well, you are in luck....because I own all there...here is my 2 cents:
- People rave about the seven Dojos.....I think they are ok, but they are definitely not my fav jeans. Mine stretch out insanely throughout the day such that if I have them on for more than 8 hours I look like I have droopy ass (which is hard for me b/c I have a big butt). They also seem to run big in the thighs for me. But, I like COH much more than sevens....so I may be biased!
- I think the COH Faye are very trouser-ish. They are sorta wide-legged. They also tend to run longer. I am 5'7" and my Fayes are about 1/2" too long - I have to wear my super-duper heels with them.
-The COH Ingrid are not trouser-ish at all. They are tighter in the leg than the Faye and a little shorter.
I am not really familiar with the Gap sizing, but I wear a 4 in Banana dress pants and skirts and a 4 in A&F. I wear a 27-28 in COH and a 28 in Sevens. Does that help?