1 to 300 Leatherworking Guide
Credit Elzix, Cho'gall-US

Approximate material list:

Leather:
Light Leather x 275
Heavy Leather x 410
Thick Leather x 565
Rugged Leather x 400
Hide:
Light Hide x 20
Medium Hide x 25
Heavy Hide x 20
Misc:
Bolt of Silk Cloth x 40
Iron Buckle x 10

Vendor Patterns Needed:

Rugged Leather Pants - http://www.thottbot.com/?i=1690
Fine Leather Gloves - http://www.thottbot.com/?i=1425
Barbaric Bracers - http://www.thottbot.com/?i=40382
Dusky Leather Leggings - http://www.thottbot.com/?i=12602
Wicked Leather Gauntlets - http://www.thottbot.com/?i=11493
Wicked Leather Bracers - http://www.thottbot.com/?i=15695
Wicked Leather Headband - http://www.thottbot.com/?i=14993

Level Item Materials
1 to 35 35 x Light Armor Kit 35 x Light Leather
36 to 55 20 x Cured Light Hide 20 x Light Hide
56 to 85 30 x Embossed Leather Gloves 90 x Light Leather
86 to 100 15 x Fine Leather Belt (Keep All) 90 x Light Leather
101 to 120 25 x Cured Medium Hide (Keep All) 25 x Medium Hide
120 to 125 10 x Fine Leather Belt (Keep All) 60 x Light Leather
126 to 150 25 x Dark Leather Belt 25 x Fine Leather Belt
25 x Cured Medium Hide
151 to 160 10 x Cured Heavy Hide (Keep All) 10 x Heavy Hide
161 to 170 10 x Heavy Armor Kit 50 x Heavy Leather
171 to 180 10 x Dusky Leather Leggings 100 x Heavy Leather
181 to 190 10 x Barbaric Shoulders 80 x Heavy Leather
10 x Cured Heavy Hide
191 to 195 5 x Dusky Bracers 80 x Heavy Leather
10 x Cured Heavy Hide
196 to 205 10 x Dusky Belt 100 x Heavy Leather
20 x Bolt of Silk Cloth
10 x Iron Buckle
206 to 230 25 x Nightscape Headband 125 x Thick Leather
231 to 250 20 x Nightscape Pants 280 x Thick Leather
251 to 260 10 x Nightscape Boots 160 x Thick Leather
261 to 270 10 x Wicked Leather Guantlets 80 x Rugged Leather
271 to 280 10 x Wicked Leather Bracers 80 x Rugged Leather
281 to 300 20 x Wicked Leather Headband 240 Rugged Leather