Often the materials are based on a case that you will gain one skill point each craft. This won't happen, so you will have to buy a few extra materials while you are leveling your Northrend Tailoring.
If you are low on gold, I recommend you to try this Gold Making Guide, it can help you to make loads of gold.
If you are still leveling your character or you just started a new alt, I recommend you to use a leveling guide. You can level your character to level 120 in 8 days with this guide.
Learning Northrend Tailoring and Bandage recipes
Go to Northrend and find Charles Worth at Dalaran (Northrend), then learn Northrend Tailoring. (this npc exists in Legion Dalaran too, but he won't teach you Northrend Tailoring)
Check out my Frostweave Cloth farming guide if you want to farm Frostweave Cloth.
1 - 20
20 x [Frostweave Bandage] - 20 Frostweave Cloth
90 x [Heavy Frostweave Bandage] - 180 Frostweave Cloth
This recipe will be green for the last points, so you might need to make more or fewer, it depends on your luck.
I hope you liked this Northrend Tailoring leveling guide, congratulations on reaching 75!