Actually the effect of the 8-10th rings are insta-clicky effects not perma. Therefore they are considered spells in nature and have stacking related issues such as not stacking with CoE or Force of Nature. But the shawl being a perma effect will stack with clarity or KEI. Another thing to note though if this considered a flowing thought item it will also stack with other flowing thought items...Verant in all their wisdom has allowed those perma effects to stack unlike having multiple perma haste effects.