I bought some bags at DESERT HILL OUTLET last week. And can I refund the bags at THE OUTLETS IN ORANGE? Both DESERT HILL OUTLET and THE OUTLETS IN ORANGE are SIMON.

As long as you have your receipts, and the tag is still on the bag, you will be refunded but if for Some you don't have either of the above, they might be willing to give you store credit

Bags? Like from information desk or brand name? As long as it's in union with Simon you should be able to

Yes. With tags and have the receipts