With these olive pants : I wear a RRL indigo thermal tee. It works also with faded orange or faded red (RRL Tees) or heather grey (as pictured here).
With any pair of jeans : it matches very well with olive thermal tees (as pictured here),
or dark brown thermal tees or blue denim shirts or chambray shirts.
Bonus : for a more "italian" style : I also wear it over a brown tweed jacket. Very nice.
ok enough yellow !