Uhh bro are boxers expected to constrict leg movement, or do I just have thunderthighs?

Diggin the newfound freedom since switching to boxers, but the legs get a bit tight when I squat or bend my legs. My waist is probably about 34 inch based on the pants I buy, so I got medium 34-36 inch tartan boxers. Nice, roomy fit for the most part, but I wish the legs were a bit wider. I could try the next size up but I imagine the waist'd be too big then.