I would fess up and then curtail my shopping for a considerable amount of time. If the two of you agree on a time frame that is acceptable to both of you the sting may be less. I know that it is a challenge to all of us but having a shopping budget for any hobby helps to keep a balance. We love to quilt, we love to make beautiful things and to have the tools to do it well, but as in your case this desire has lead you to do something that has hurt your heart toward your husband. It put you in position of being untruthful and baring the guilt.
Pull back and use your stash and apologize to him for being dishonest. You are two grownups and I trust you should be able to help each other out to solve this situation. I pray that you will be strengthened through this and not defeated.