I have always used the HOUSE RULE that vacc suit covers vacc suits and combat armor, where the skill battledress covers battledress, vacc suit's and combat armor. With battledress being a combat armor with motor assist, yes putting the armor on may differ from putting on a vacc suit. The skill battledress just supersedes vacc suit in every way. In my games when a character learns vacc suit 0, then learns battledress vacc suit no longer needs to be listed on the character sheet. Any advancement in battledress skill in my games increases vacc suit accordanly. So example Battledress 4 = vacc suit 4, but vacc suit 4 = no battledress skill what so ever. Now please dont flame me lol.