I already tryed with paint but why i get white or black background!? I saw other hat's they have white background but when i put it i have in game white backgound other's dont.
There are many ways for making a background transparent in cs2d.
1. Use .png images with blank background
2. Use .bmp images with pink background like someone above me posted earlier (dont have the colorcode in mind)
3. Use a black background and use masking ingame (script or map editor, as you want a hat it will need to be scripted)
Ect.