I mostly play third person because of the seams or i cover it up with gloves or braclets. I recently started to play with outfit studio and figured out that alot of clothing and body parts (first person hands/feet) can be changed. For example you can actually replace the seamless hands with the seams hands.
You can delete parts of clothing (vertices) and replace it.
So basically if you manage to find an outfit that does not have seams in first person, you can use those and replace it with the seams. But remember when you batch build body/clothes again, you have to re do this all over again. So make sure you have the body and clothes you want.