Well, this year I fked up a bit by picking some too close to herbicide. However, if you can avoid that or learn safe work arounds, picking blackberries (and blueberries, if you have a surplus of those and a deficit of bears!!) is one of the toughest yet most rewarding summer pastimes available.
You need: light but tough boots, heavy enough to trample a large thorn vine and take the weight of jumping from logs/stumps/etc.
Slightly loose jeans heavy denim, need to fit close to your boot.
Sport bra and light weight thorn resist jacket or raincoat
Goggles or sunglasses
Non optional hooking tool for reaching vines too far away from hands withoyt getting stuck. A 90° angle vintage screwdriver or even a wire hanger works OK but you probably want iron at the minimum. Slippage = ouch
A plastic coffee jar or milk jugs with tops enlarged
Freezer bags and a waterproof or absorbent shopping bag or basket, umbrella to shade basket
Car or bicycle with trailer Or a large waterproof backpack
http://www.motherearthnews.com/organic- ... rries.aspx
Humans sort of suck for spraying free food with poison for profit.