Gear changes from vendor to vendor, based on when they carry these items and sometimes they will offer something, they sell it out and that's it...! Todd's used to offer pants in the not in the so distant past but once they sold out, no longer.
Current list of venders and offerings (recommended):
Hats
Akubra Fed IV, sold through Hats Direct of Australia
Garrison Hatters
Advintage Hats
Penman
Jackets
Todd's Costumes
Wested
Steele & Jones
Bill Kelso
Shirts
Wested
Todd's
WPG
Azuma
Magnoli
Pants
WPG
Wested
Magnoli
Belts & holsters
Make It Jones (England)
Todds
WPG
Magnoli
Boots
Alden
various close enough makers
catch a good deal on Ebay
Vendors cycle in and out, based on offerings and availability. Wested now offers a decent combo special, where you can get virtually all the gear at a good price.