The Saradomin team cape should not be confused with the Saradomin cape. Bandits will not attack players who wear this cape. Visually, the difference is that the Saradomin cape is a darker blue and has a yellowish-white trim.
There was a major glitch when non-member players were getting the capes, by taking a ride on the gnomecopters to Castle Wars and reading the signpost. Then they would go to the next floor, click on the ground then select "report abuse", allowing them to enter. This would end in players being muted for 24 hours.
At one point, there was a glitch with this cloak and the Zamorak team cape. The hood and parts of the cloak itself appear to change colour based on what top your character is wearing when no armour is equipped. This glitch has effectively been resolved.