I was looking for a pair of BF white jeans for a while, thinking I would like the slouchy look for summer. I tried the Gap "sexy boyfriend" in white in two different sizes and they were all wrong: they had a pretty high rise, very large thighs and then tapered, and the fabric was pretty thick and stiff so there was no drape (sort of like bad Mom jeans). I've seen Una's Gap BF ones in traditional blue and they look fab (and Anne's today do too), so maybe the white ones were just weird.
Anyway, I realized that I hated that look (the white ones on me) so I thought I might find some straight-cut or skinny ones and size up. Yesterday I found the perfect pair at J. Crew. They are matchstick one size up, in a soft, brushed, faded dark denim, and they were marked down from $108 to $29. They are mid-rise and cut pretty straight all the way down, rather than being roomy through the thighs then tapering.
This is my long-winded way of saying that you might need to experiment with different cuts, and ones labeled BF might not necessarily be the best cut, depending on what you are looking for and what works best for your bod.