Ah, the dreaded stitch Nazi syndrome! The General Miles Marching and Chowder Society died from that malady! I'm all for authenticity, but it gets to be no fun fast when no one can play because of the cost. As an aside, one thing I've noticed about some of the worst stitch counters is that they'll have a museum quality uniform and equipment, but they look totally wrong because of the extra seventy five to a hundred pounds. They're also usually WAY too clean and "new" looking. Just my opinion!
The sad reality is many try to use the term "authenticity" as a large hammer in two different directions. Without some form of set rules, we would have people showing up sporting all kinds of oddball kit. For instance, I remember one event where a participant was allowed to attend a WWII event. He was wearing modern hiking boots, tan Dickies trousers/tan Dickies workshirt, two M1 Garand cartridge belts attached to each other, so they would wrap around his girth, a Vietnam era M1 steel pot and carrying an original M1 Thompson. This was not an attempt, it was a mockery of the men who originally wore the uniform.
While there are bad apples in every activity, they come in all forms and have their own opinions. There are extreme opinions on both sides of the coin.My suggestion is to find a group and see if your goals are similar to theirs. Most groups are more than willing to loan and help a person genuinely interested. I have been doing this for years and I have yet to meet a group that would not do their best to help.
As for the weight issue, that's largely due to the fact that this is a middle aged male activity, young guys can rarely fork out the money required for an expensive hobby.
And to Grenadier: you should bring that outfit and come out to the Grand Muster, I'm sure that ReichsRevolver would like to come out and play there with the variety of other 19th century stuff that will be there.
I'd love to, but my schedule is largely booked for the rest of the year. I have too many hobbies with too little time for them.