Leatherworking 1–450: leveling up (WotLK)

Leveling up Leatherworking from 1 to 450 on WotLK 3.3.5a: where to get leather, what to sew in sections and profession bonuses (bracer overlays).
Briefly
The leatherworker makes armor for agility/strength, bags and bracer linings (Fur Lining is the best enchantment for bracers). You need leather - from Skinning or auction.
Materials
- Light/Medium/Heavy/Thick/Rugged Leather - 1–300
- Knothide Leather - 300-375
- Borean Leather, Heavy Borean, Arctic Fur - 375–450
Pumping by segments
1–100
- Handstitched items, Light Armor Kit - Light/Medium Leather.
100–200
- Fine/Embossed Leather Kits, Heavy Armor Kit.
200–300
- Thick/Rugged stuff, Nightscape/… sets.
300–375
- Knothide sets, Nether items, BC overlays.
375–450
- Borean sets, Frosthide/... WotLK items, final - on northern skin and Arctic Fur.
Tips
- With Skinning the skin is almost free - I recommend the bundle.
- Fur Lining (liners) sell to the raid - a hot commodity.
Summary
Cheap profession with your own skin; 1–450 goes quickly.