Catsuit clothes open alpha chanel problem

[Clara Cox]

Greetings. I need help making a transparent suit r9catsuit001. I need to make it look like the suit is unbuttoned, but when I remove part of it using the Gimp2 program and apply alpha chanel for transparency, that part of the suit becomes white. I applied this to several suits and it worked and now it won't. Does anyone know how to get the suit unzipped? Thank you. The files are attached.

AA3-Catsuit001.zip

[Fidgety]

Change the .txf to "RGBA_8888" "AlphaMask"