Lightweight merino wool or cotton baselayer. Baselayers are the tops closest to your skin.
Midlayer or rain shell (sweater or puffy jacket packed).
Shorts. Cotton pants are OK. Cords or denim not recommended.
Sturdy, traditional sneakers or hiking boots.
Minimalist and max cushioned also OK.
Light cotton socks. (I do not wear socks.)
Bandana (it's multi-purpose and always useful).
Bug repellent (like DEET).
Some kinda daypack.