When possible, I try to avoid brambles altogether. But sometimes I simply don't get that luxury (usually tracking or attempting to catch up with elk on their trails). If I end up in the stuff, I just try to be careful and methodical with each step to avoid getting snagged. I would imagine it looks quite amusing from afar. I would rather be comfortable in my Sitka Mountain pants or Kuiu Attack pants than trap my sweat inside of bibs. Just by trying to avoid the brambles as best as possible, I've managed to use the same pairs of pants for many seasons now.
Where I seem to struggle the worst with thorned vegetation is out in the middle of a clearcut, where I'm constantly dragging my boots through nets of low lying blackberry that hide in the grass and downed limbs.
Also, the typical Himalayan blackberry bushes are one thing. The cutleaf evergreen blackberry bush is another beast entirely. That stuff is awful. I'm doing an about face 180 whenever I run into clumps of that stuff, no questions asked.