Comfort - details pending
Dress in layers! It gets cold standing still all night.
Careful of bug sprays near telescopes and eye pieces it can effect the coatings and ruin your investment!
Comfortable shoes and bring a chair
Red light flashlight to retain your night vision and ability to read your charts and find your way. Fresh batteries so you are not stuck in the woods and the batteries die leaving you in the dark
gloves with open finger option as the little pieces involved with eye pieces and reference charts can be challenging in gloves
Binoculars... even with a 16" telescope you will want the ability to do a quick view of something like a passing space station or meteor
Something warm to drink and a snack