Giacci means jacket or blazer, so I'd say it means "Sydney Unifrom" or something approximate.
If it's Gioci, that also mean "sydney Games".
Yay for online translators!
What is important is the other clothing tag, which will probably display sysmbols as described on this page:
http://ohioline.osu.edu/hyg-fact/5000/5556.html
Should tell you exactly what you can and can't do with it.