How can fix it ??

[Dorabella]

I have a problem with a dress .  [Rektas] Sanguine

 

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To solve this, I saw a video that performs the separation of the various parts: mask, separate vertices, rename the part . 

 

The problem is that, when I go to nose, the whole dress is taken, making it effectively impossible to divide it into several parts

 

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How to do ?

 

 

EDIT 

I also have the same problem on another one; solved the first, I solve the second too

Edited November 19, 2022 by ?????? 1627