I'm seeing Ran's right leg with Bya's left. It's certainly not distinct, but they're sharing one leg of the stocking, while Ran's left leg is outside the picture. You can see the start of it to the left.
I see both pantyhose and thighhighs (Byaku's wearing thighhighs, and is sticking her leg into one of Ran's pantyhose leg openings, whereas Ran already has her leg in the other.)
At any rate, you can see the garment Ran was (trying) to put on is pantyhose because the two legholes are connected.
VGK said: (Byaku's wearing thighhighs, and is sticking her leg into one of Ran's pantyhose leg openings, whereas Ran already has her leg in the other.)
That's a single thighhigh that they're both sticking their leg into; it just looks like pantyhose because of the angle of their legs. Note how there's fabric stretched between their feet, which wouldn't be the case if those were the two separate leg holes of a pair of pantyhose.