Pockets are fine, I use mine too, but I only have one, and no more than two in them.
What helps too if you've got all your eyepieces in a case, is a hot water bottle in the case with the eyepieces. It keeps them warm so when you come to select one that hasn't been in your pocket, it won't instantly fog up.
I take a thermos of hot water with me, and it sees me a change or two of the water through the night. You'll need to change the water after about three hours or so as the night air will suck the heat out quickly. You can also drap a towel over the eyepiece case with the hot water bottle in the case. This will insulate the heat and make the water exchange happen less frequently.
You can also get a cosy for the bottle too. This will temper the heat so the eyepieces won't become hot, just warms them gently.
There are also heated eyepiece cases, and there is a fellow here on IIS that has got one for sale in the classifieds section.
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