How?

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.

that bolded part is wrong, if the hat requires 25 dex, and you go under 170+25 secondary, it will unequip itself (and the rest of the set)

i have a somewhat detailed guide of how the whole thing works on basil, didn't go into how %all stat/dex works though