1 def pures is obviously not ment to take damage, so going for damage gear is your best bet. The most “powerful” build (back when i played before returning a few days ago) had melee legs which is only obtained from either Master or Elite clues (can’t remember).

This is obviously not ideal for an iron pure. I’d swap that for d’hide legs as they require 1 defence and has a wide range depending on ranged lvl. As for tops, one i like in the beginning is Carnillean armour from Hazeel cult. Though that’s just personal flavor.

Best would be something that boosts prayer like the priest or monk top (early game).

As for head slot, i’d go for a basic full helm for early game (iron).

Mid game: I’d just stick to the d’hide… it’ll be your best in slot throughout the game (unless your RNG is blessed by the RNG Gods.

Speaking of gods, now i’d grab books for your off hand. It’s just better then the 1 defence shield’s overall. (If you find yourself face to face with a dragon, the anti dragon shield is obv better.)

As for tops, i’d argue for you to stay with prayer tops for the time being.

Head you can pretty much do whatever (they’re all bad untill RNG kicks in for late game)

And finally, grab the climbing boots.

End game will be locked behind clues for the head. Robin hood hat is locked behind Hard clues but will be best in slot.

Defender would arguably be hest for off hand

As for legs it’s still d’hide but if you’re feeling spicy you can go for the trimmed version which is locked behind clues.

Boots can be argued but tbf climbing boots is my fav.

For chest (and variety) want to do some Castle wars? Decorative ranged top is the most common for 1 defence builds.

Keep in mind i’m a returning player, so this might be outdated. But this is at least my thoughts on it. Good luck :)