I'm on a tablet -- photos are a pain on the mobile version of this site. Google Gold duck wing chicken and silver duckwing chicken and you'll see countless examples. Note the wing patches on the males while the females have a drab, evenly patterned back. So, those patches are what most often give away a male that starts off striped.
I have been thinking my chipmunk striped ee is a male all along. "He" is only a week old but has thicker legs, and better posture than my other ee. "He" also comes running over when I pick up my other ee, like he's coming to her rescue. She normally just follows him around.