If I order on line a swim suit that was not available in store in my size, can I use my store bucks and is their a discount for using my Macy's card?

As long as the store bucks are valid for that item, not sure about the discount for Macy's card.

Store bucks you can use. Only discount for selected items (see ads).

Yeah sorry man i dont know about Macy's

Store bucks can be used, macy' s card gives no discount unless it is stated in the ad.

Yes, you do get a discount for using your Macy's card went ordering online.