It should read "This is the pantyhose that Ruby wore." Even if not, a plural item would require plural verbs ("these are" Ruby's stockings, not "this is"), the word "stockings" is misspelled, and "Ruby worn" misuses the past participle or "wear" (either "Ruby wore" or "Ruby had/has worn" would be correct).

Remember there was a similar sketch but with fubuki_(kantai_collection) wearing mutsuki_(kantai_collection)'s pantyhose. Anyone know which post since I can't seem to find it (no it is not pool #10033)

gary25566 said:

Remember there was a similar sketch but with fubuki_(kantai_collection) wearing mutsuki_(kantai_collection)'s pantyhose. Anyone know which post since I can't seem to find it (no it is not pool #10033)

It's from Mountain Pukuichi. Unfortunately, he's a banned artist so the sketches are no longer on danbooru. But here's the sketch in question:
https://dynasty-scans.com/chapters/before_and_after#24