Unfortunatly, JSL is no longer in business........he had some righteous stuff.
Reenacting has what some call the Sliding Scale of Imperfection.. Some call it History Heavy and history light
Farb: Nothing is really "right", if it looks old' timey and sort CW, its good to go, little attention paid to authenticity (History light)
Mainstream: The general run of reenactors, attempts are made at authenticity, some stuff not quite right, but attempts are made to make things look right May Contain Farbs and Progressives. Impressions can range from Museum quality to WTF?
Campaigner/Progressive/Hardcore: The History Heavy side of the hobby. Every attempt to the 3 Ms, (Man Material and Method) are made, events have standards particular to the event and the time and place being depicted. Details such as buttonholes, correct cut and material and constuction methods are insisted upon, weapons are defarbed, Personal Items are accurate, down to envelopes, stamps, and labels on prepared foods. Unless the scenario requires it, tents are limited to non existant. Meals are period correct with period foodstuffs, and soldiers often eat out their haversacks. Adherents to this stile are known to haunt museums, no matter how obsure, and libraries and historical societies. Some also become addicted to pieces of equipment, becoming Knapsack, or cartridge box , or jacket or hat junkies, and can often bang togehter a killer impression of the ANV in 1863 one weekend, and then another weekend be an 1861 Milita the next and Late War Army of the Tennessee the next. Some will buy special kit for one event.
Hope this helps.