I just graduated last Friday and was running the lucky bag room during Indoc processing for 08-18. The uniforms you'll use at OCS are Type 3s (NWU and Parka/liner), all weather jacket, relaxed fit jacket, Khakis, and SDB. Bring what you have. They will inspect your uniform during processing. Anything that doesn't get approved will be stored in your luckybag. We are issued Belleville 360ST, it would definitely help save time if they were polished already. Bring your rating badge,trident, and ribbons, you'll be wearing midshipmen anchors while at OCS.
PS. There's currently a SEAL Chief in 07-18 and he pretty much had everything and was mostly good to go.