Think about it. If you used these leggings and the cloak, you'd be neg 10 to magic resist. That's a big difference in overall resists when the more resists you have, the more likely you'll survive a high level encounter.
Even saying you can make up the two -5 MR hits with other +MR items, this still means you'd be 10 lower than you could be. And for what? 19 intelligence that just about any INT caster doesn't even need anymore to hit 200 int.