Considering the card is a month old, your only chance is to call Macy's credit department and plead your case perhaps by saying that you need to "invest" in new business clothes and you'd like to give Macy's your business because you like their products (it just may work). That being said, I noticed in your signature line that you have opened a bunch of cards recently (3/18) Personally I'd never have a Credit One, but sub-prime vulture cards aside, you have already damaged your chances for getting better limits with inquiries and a lot of new accounts (low average age of account(s)).
Wait a year until next April and your multi-inquiries will no longer damage your scores and you'll have a year experience with your current accounts - then ask for a credit limit increase. One final thought, store cards such as Macy's carry high-interest rates please be sure to pay those in full every month since if you carry a balance you'll end up paying a lot more for those purchases than the "sale price".
