Anoint them [Aaron's sons], as you anointed their father, that they may serve me as priests. And their anointing shall admit them to a perpetual priesthood throughout their generations. (Ex 40:15)
This verse at the end of a lengthy description of brestplates, ephods and robes, turbans and costly stones, cuts straight to the heart of the issue. For all the external garments that marked the priests out for who they were, it was the anointing that actually qualified them to minister before the Lord.
Since we are now a kingdom of priests, and each one has a ministry, whatever area of service to the Lord, his people and his purpose that might be, we should all take note. It is not the recognition, nor anything else that marks you out externally that counts. It is the anointing that qualifies you. Seek the anointing of the Holy Spirit. Once you have that, the anointing itself will "admit" you to the ministry you are called to.