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Perhaps she's not wearing stockings.
It's long socks called knee socks(knee-so) among OTAKUtachi("tachi", is plural, but it can be without in Japanese).
It's visually transparent, but a creation. It's only depicted as such, and in context it should be interpreted as just socks.
Tifa herself, the original story, does not wear it, and the text on 032p says "knee socks"(ニーソックス).
At first, the main character boy is a pervert who fantasizes, so his images is transformed in his brain. Now, you can already see, this manga is drawn from a first-person perspective also.

I'm not your family, so I commented only.

Base +6