These are some sources for uniform/insignia items. Linking to a vendor here does not necessarily represent an endorsement and you are not required to buy from these vendors, but they should give you a better idea what to look for.

Uniform Shirts:

• Security Uniform Shirt QuickUniforms.com LS2 (select tan) $10.95 ea a/o 9 October 2012
• Surplus City (Springfield) - Surplus Army green uniform shirt ~$10 ea.
• The Bunker (Wyandotte, OK) - Surplus Army green uniform shirt ~$10 ea.

Uniform Pants:

• Security BDU Pants Ripstop R59-23-29-41-35 (select tan or green) $29.95 a/o 9 October 2012

Skill/Affiliation Pins:

• CERT Lapel Pins - Prepare Smart MI-4003 $4.20 ea a/o 9 Oct 2012
  • ​alternative: Sunset Survival MCRT-PIN $5.50 ea a/o 9 Oct 2012 (smaller)
• ​ARES Lapel Pins - ARRL 0241 $5.00 ea a/o 9 Oct 2012
• First Aid/CPR/First Responder Pins
  • First Responder Pins - Medical Emblem Co PN-2102 $3.25 ea a/0 Oct 2012
  • First Aid Pins -Medical Emblem Co PN-1902 $3.25 ea a/o 9 Oct 2012