Trail riding either a dirt bike or adv bike I go with
- Alpinestars bionic chest protector
- Knee/Shin guards
- MX boots
- Vented MX gear
You can add elbow pads and a neck brace if you like. Elbow pads tend to give me arm pump and the neck brace gets in my way while trail riding but I do wear one when I ride MX. Knee braces can be a good idea instead of knee pads as well, personal preference.
BTW I think I offered to meet you at the Scorra trails last summer. Invitation stands if you want to venture in again. I can give you some tips for the sand etc and you might feel a little more comfortable if someone is there to help pick the bike up.