what's the name of the seam you get down the outside of your jeans??

[MummyElk]

do you know what i mean?
is it just a basic french seam with another line sewn down it again?

If my memory serves me correctly, think it's called a 'run and fell'.. but i may be wrong..

Its called a 'flat felled' seam (just googled it).

top stitch maybe?

thank you - ummagumma you are right that's exactly it. I did try googling but obviously not the right words! Just learnt how to do it on youtube too. marvellous.
Thanks all