When i was agency they offered a branded hivis a d that was it, but i had to pay £1 for the privilege of pointing out i was a limper…yeah that gonna happen (Lidl only charge 10p for their bags to do the same).
Beyond that dont bother as mentioned with anything you’re given unless its from employer and specific to the job, eg goggles. Even full-time they provide some good and some rubbish.
Good boots and a waterproof jacket (hivis type even better) and you’re sorted.
Oh re cig lighters, just remember some ports are 12v and some 24v. Many things will cope with both but not all. Also need a hella adapter for some trucks amd one of those battery blocks for when the cig lighter fails (they do, often).