Couldn't capture this in a photo, but perhaps you've encoutered something similar: a fabric with two wrong sides.
I'm muslining the Jalie 2908 stretch jeans in a too-stretchy something I picked up for 1.99 to test the pattern with. It's an icky pale blue, light-denim weight but not a twill; the weave on one side looks exactly like the "wrong" side of real denim. The other side looks exactly like the wrong side of something else. What, I don't know.
While cutting the fabric I changed my mind several times as to which side was the "right" side, and finally decided there wasn't one. I picked a side and decided to go with that. Today, basting up front/back for a quick try-on, I went the other way.
I wish I'd remembered to cut the muslin with extra-wide side seams. "Boot cut" and I are not friends, so I straightened out the taper, adding some width at the knee and bringing in the flare to a straight line. The end result would be fine if I were slimmer through the hips, but as things are now the narrow leg makes my wide parts look even wider.
On the whole, though, not bad for a first muslin. I'm already thinking these could be cute at capri length, under a tunic. If nothing else, it might be worth finishing these pants for those days when I don't feel like working out. I could put them on instead of my exercise clothes and admire my rear view for a dose of instant inspiration.
Speaking of pants, I finally got the Marrakesh pants pinned for hemming. It took about six tries, spread out over ... how long has it been? 10 days? Felt like for-frickin'-ever. Anyway, as of this morning they are pinned and ready to hem. As soon as it cools off enough to plug in my iron I'll press them and try to remember how to use the blind-hem foot on my machine.
I've heard that every blog post needs a picture, so here's my little cutie enjoying one of his favorite toys. This box had one open end for pantry use, and when he became fascinated with it I cut a large hole in the other for greater play possibilities. He likes to "hide" in there (sticking out both ends) before pouncing.