Tailoring and Arts

Qistrel

Does your Arts skillrank affect anything in Tailoring? Like months on clothes you make, number of months you restore when mending, that sort of thing.

Xenthos

Yes to both; anything with the same parent skillpool "feeds" other skills and increases their efficacy.

Tailoring             Transcendent   Finearts
Arts                  Transcendent   Finearts

So with both of them at trans, your clothing will last longer than if you only had Tailoring there.