In English, "gear" can mean any equipment that is used for a particular purpose. For example...
Running gear: tank top, shorts, running shoes, athletic socks
Swimming gear: swimsuit, swimming trunks, goggles, hair cap
Fishing gear: fishing pole, bait and tackle box, fishing hat, flannel shirt, vest, outdoor chair
If you want a nice English dictionary online, try: http://dictionary.reference.com/
I hope my answer helps. Please let me know if something isn't clear. 我也可以用中文解释。