Most important thing: good boots. I mean - in no way too small. Socks: cotton, then - wool, then (non-mandatory) - nylon over wool.
Don't even think about wearing "keds" or other footwear with soft soles. Get a pair of army boots. I don't mean Soviet "sapogi", just good army boots. I wore "sapogi" hiking for maybe 4 seasons, but it was "experimental" model, with polyurethane soles and 3 times lighter then standard "kirzachi". Army boots have many advantages over new-fangled hiking boots like Solomons. I have seen people returning from a hiking trip having their $120 Solmons tied with strings to hold them together.
An axe. Best stuff I have ever seen is made by Fiskars, Finland. "Forest axe" model, costed me about $50 10 years ago and I still have it and it payed me back every cent. An axe IS important!
Karemat (polyurethane foam carpet). Your kidneys are valuable for you, aren't they?

I usually wear cotton camo suit, the only thing bad about it is that it doesn't have a hood. Cotton is better then new-fangled synthetic stuff - at least you can get drunk and fall into a campfire and it will not melt down like Gore-tex

A "nakidka" made of Korean waterproof nylon.
A tent - I hope you'll choose yourself what you like better. I have a "Sierra" model with two exits, 2.5kg total with aliminium frame. Fells like an oversize coffin - but I don't think I'll arrange parties inside

It's enough for 3 persons, it's warm, for two it's just enough space for... you now what

And get a smaaall bottle of ethanol (pure 96% wine spirit). 50ml of this stuff will revive you when you'll be setting up a camp after walking for 30km. 3 days for at least 3 participants = 0.5L, including some reserve just in case you'll have problems making fire

A backpack: I prefer stuff that has a frame, it's easier to carry and when you fill it you simply put the stuff in and jump upon it so it will fit. Check a belt to unload your shoulder strips (lyamki) - it's important. It has to be right over your... how to say it in English... "kosti taza".
I hope I'll be on ICQ in 12 hours - so we'll talk in our language without fear to get "#16ed"
