Dan here, checking in from China:
1) I like jersey news, but I don’t like the Eagles black alternate. From a set that screams “late 90s” (and, as Kyle’s said previously, losing NFC championship games), aside from the “it’s an Eagle… but it’s got an attitude!” logo, the black jersey is the worst 90s relic they have. BUT, I appreciate when they do anything different with the uniforms, so it’s worth discussing.
2) From the comments, the Eagles usually wear the black alternate with white pants, but they did pair it with green pants in 2003 and 2004. People usually have positive things to say about this combo every time we write about the black jersey, but I don’t find it to be anything other than an answer to a trivia question and notably ugly.
3) Also from the comments, the Eagles have worn all green, but only in 1997 and 2002. Again, it makes for better trivia than a good-looking uniform. Of course, 2013 has been a year of monochrome, with the Chiefs and Browns breaking out solid color uniforms for the first time ever, and the Vikings, Cardinals, and Titans showing up in single color combos not seen in a few years. (aside from the repeat offenders like the Saints, Panthers, Broncos, Texans, Bengals, Jaguars, and Seahawks — sorry, there’s no football in China. I take what I can get.)
The Gridiron Uniform Database is a great site for info like this.
I also have more pictures here.