I thought this was another QQ about sins being too op..
With full dragon set, you'll have 2.86. (Including 0.5 Int and 0.5 cape)
For the 0.5 Int Cape = You can get the first Lunar cape. Buy a Wing Trophy in boutique for 4 gold and get the cape.
Later on, you can farm for Supreme Robe and NW Robe, which you can find a guide in the Guides section.
For the 0.5 Int tome = Pan Gu tome gives you a fair amount of attributes and Int. Its the cheapest tome there is, after that when you have enough EC, you can buy level 7 tomes.
With all those, you'll be 2.86 in FULL DRAGON set.
In order to get 3.33, you need r8. By mixing r8 legs, arms and boots with DRAGON top and DRAGON head, you'll get 3.33 (Along with tomes and cape) In order for you to get 3.33, you need to have 2x 0.5 interval on your r8 arm. Which means, you'll have to reshape your r8 arm till you get 2x Int on it. If you get 3x int, gratz, you're 4.00.
That's all to it, goodluck.