The importance is given over to Yashuah ha'Mashiah and His Father YHWH. Personally, I find jackets prohibitive since the MS has transitioned into Progressive. But as I Worship, I often raise my Crippled hands to show YHWH, Yashuah and Ruach that it is The One Elohim, Our Elohim, One God viewed in Three Persons, YHWH (The Father). Yashuah ha'Mashiah (Jesus, The Christ) and Ruach (The Holy Spirit). If the Biker is comfortable wearing hi best Club Colors and his 24" Pig Tail to present himself to the Master, who would I be to judge anything but the fruit of his worship?
I have friends like that and most of our other Old Biker Friends that worshiped with us have already transitioned into Eternity, one side or the other, according to the Righteous Judgement of Yashuah. Those of us that seek The Healing Touch of Our LORD have not the time for anything but to worship.