What does "dress" mean in this sentence?

[Fajr]

Hello,

What does "dress" mean in this sentence?

I usually wear a nice dress shirt-, but nothing too formal.

[Ivo]

Hi Fair,

dress shirt = a man's shirt (white with a starch front) for evening wear (usually with tuxedo) = evening shirt.

http://www.answers.com/main/ntquery?s=dress+shirt&gwp=13

Regards,

Ivo

[Jamie (K)]

It means a nice shirt, but not only for evening wear. It would be for formal or semi-formal wear, whether in the daytime or evening. Some people even have to wear dress shirts and ties at their jobs.

[Cerberus™]

http://en.wikipedia.org/wiki/Dress_shirt