Combined, the 5 pieces give 93 of your secondary stat, +20 from the 5-piece set bonus. You get 113 of your secondary stat, and you only need to get from 117 to 170. The cape doesn't require any stats, btw.
And if you don't understand, how it works is that you need 170 from bonuses to equip it. If you're equipping, say, the hat (25 secondary) then you need 170 before you equip it, once you equip it, you can take off up to 25 dex from other equipment, and as long as you have 170 total WITH the hat on (excluding %stat) it'll stay on.
Better explanation: If you have an overall AND a hat (30 secondary, 25 secondary) and you have 155 total secondary stat, you can use mega monkey magic, equip both items (giving you 200 secondary without monkey magic), and then let mega monkey magic run out, your equips will stay on, and you've faked the requirement.
Another example : say you have 57 secondary stat. The hat, overall, shoe, glove, and cape give you 113 secondary. Find other equipment, potions, and such to get your secondary stat to 170. If you have 170 dex while not wearing an overall, equip it, and then equip everything else (highest to lowest is best). You'll successfully make each piece self-sustaining with relying on a different piece that requires the same amount.
Better explanation: If you have an overall AND a hat (30 secondary, 25 secondary) and you have 155 total secondary stat, you can use mega monkey magic, equip both items (giving you 200 secondary without monkey magic), and then let mega monkey magic run out, your equips will stay on, and you've faked the requirement.
Another example : say you have 57 secondary stat. The hat, overall, shoe, glove, and cape give you 113 secondary. Find other equipment, potions, and such to get your secondary stat to 170. If you have 170 dex while not wearing an overall, equip it, and then equip everything else (highest to lowest is best). You'll successfully make each piece self-sustaining with relying on a different piece that requires the same amount.