Interfacing In an Argyle cuff?

[Bugbear]

* Rewrite *

I'm wondering if the interfacing that is already in the cuff of the jacket I want to convert will work for an Argyle cuff or if I need to use something different.

Here is what I am thinking about doing.

The sleeves of the jacket are too long for me. If I were to take out the hem of the cuff, there would be enough material to turn back the cuff over the sleeve as far as an Argyle cuff would go. I could put a facing over that turned back part to look nice and give the cuff the Argyle shape.

Because the sleeve is so long, almost all of the interfacing would then be in the turned back part of the cuff instead of up the sleeve. It would still extend a little way passed the fold at the end of the sleeve.

Do I need to add interfacing to the sleeve if I do this?
Or will the interfacing that is in the turned back part do the same job that it did on the inside of the sleeve even though it is now on the outside cuff part of the sleeve?

It's hard to describe that.

Thank you.