Even if I am dressed up as a member of the Legion I get attacked immediately. BTW I am vilified by the Legion

Any one know why? or how to get my Legion rep up?

This happens to me if Boone is by my side...

Is Boone with you? Otherwise, only thing I can think is that an officer or named Legionary has seen through your disguise.

You can only get your rep back with them right after dealing with Benny when Vulpes Inculta gives you the Mark of Caesar (or whatever they call it). That wipes the slate clean. Only that one time though.

Thing is if you left him at lucky 38 when you went in the first time. where he does not follow you anymore but you got the spotter perk. go talk to him to wait for you at the lucky 38 loose the spotter perk and everthing is fine