what Size Mask Erode or Dillate For Custom Manual Inpaint ?

[tryinghard247]

for this normal habit manual inpaint for this size what value mask erode or dilate i should use ? currently i use -5 but sometimes its still appear the unwanted color which is the one that over paint .

hope you guys understand my question . i dont want using manual detect upper clothes or sam its sometime for complicated texture its also mask it .

my achieve its to keep the clothest only but the model its different . maybe i would say its already work 90% when i check invert mask and generate and modify. but not precise for manual inpaint . and i dont want auto generate mask for clothes or sam because some complex design i cant fix it because its show black in mask setting .

and my question is for that manual inpaint for like that what Size Mask Erode or Dillate ?