Recipes changes
Tier 3 items are not Thin Leather, I think you brought the wrong tier.
Here is a list of the ingredients from the Wiki:
Tier 3:
6 Cured Coarse Leather Square
18 Bolt of Cotton
10 Spool of Cotton Thread
6 Strong Intricate Cotton Insignia
http://wiki.guildwars2.com/wiki/Satchel_of_Strong_Masquerade_Armor_%28tier_3%29
You may have looked at Tier 2, rather than Tier 3.
Tier 2:
http://wiki.guildwars2.com/wiki/Satchel_of_Strong_Masquerade_Armor_%28tier_2%29 (Uses Cured Thin Leather Squares)
Good luck.
Thank you inculpatus…I checked wiki and I noticed the differences. I still think it is misleading since if you buy the recipe from TP both have the same name. Yes you can see the crafting lvl ( 125 and 200 for the T3) but still…Not fair.