There is one guy I know that portrays a member of the 79th. However, I haven't been in contact with him in quite some time. However, here are a few sources for your viewing, in addition to the great info above.

These are some reenacting groups out there that, portray the 79th NY. There should be a gallery on their website, along with historical info that might be of help:
Company A, 79th NY Volunteers
79th NY Cameron Highlanders, Company B
79th New York Cameron Highlanders
Cameron Highlanders of the Northwest

Here are some sources of general info:
http://en.wikipedia.org/wiki/79th_New_York
http://www.nycaledonian.org/79th.php
http://militaryhistory.suite101.com/...von_hindenburg

The guys in my unit have been kidding me about getting a period correct kilt and, wear it out to some of our events. But, its not historically accurate for my unit, the 6th Indiana Volunteer Infantry Regiment. Even though, the individual I portray, Assistant Surgeon William A. Collins, is of Celtic descent (my sources say, Ireland), there are no records of him wearing a kilt.

Just be careful of who you buy from. There are those that try to make a buck, and sell crappy stuff. Then, there are the better vendors that, make period correct uniforms and accessories. Just do the research first, then have fun with building your "kit" (period impression).