Zombie Pam Barely Covers Her Clam!

Pamela Anderson stepped out on Tuesday evening ... almost wearing this little little black dress.

The zombie-eyed blonde spent the night traipsing around Hollywood in this near-nightie, stopping at trendy hotspots like Marix Tex Mex restaurant and the swanky Chateau Marmont on Sunset Strip.

It's unknown if Pam was able to sit down in this almost-an-outfit, but all eyes were on Pam ... and hers were on them!