Hey everyone, I'm working my way to 90 thieving. I have gone from 81 to 88 thieving in PP without getting a single piece of the Ibis outfit... is there something I should be doing, or is it just really rare?

It is still pretty rare to get, it took me from 16-25m xp to get the full set + SOTG.

 

Getting a SOTG will improve chance of ibis pieces however that requires 91 Thieving and is rare itself too.

 

Just keep going and try to loot as many urns as you can and eventually you'll get it and try RoW too (it might help).

It was made more common recently (ish) but it is still quite rare.

If you are looting urns you are doing all you can do.

Sceptre of the God's as mentioned above will help so once you hit 91 make sure you open the engraved sarcophagus in the final room (not the normal one) as this is the only place that gives it out; with the Sceptre (post-rarity tweak) it took me like 2-3mil xp to find full Ibis