Personally I was a little dissapointed by this DLC - it starts off all 'survial horror' but ends up the usual 'kill anything that moves' by the end of it. Even my steath specialist had more money, med kits, food, ammo and weapons to dispatch any number of ghost people with relative ease.
I did find it funny as well how you can enter the DLC area with companions and get 'knocked out' to enter the DLC content your companions just run off - "Oh well, I guess he wanted a nap, lets just leave him to it"
I played it on hardcore mode straight away and finished it within 4 hours I think - the ghost people move around alot but with good enough skills and VATs it makes short work of them (even shorter if you use energy weapons with the holo rifle or melee specialist).
Once you've figured out that the ghost people aint all that bad it stops being difficult and almost tedious - especially when you get into the hotel itself because it stops being 'survival horror' at all and just seems to give you 3 meaningless quests, running around a mainly empty hotel to 'tie up lose ends' of your team mates (either befriend or kill them)
Even the loot at the end of the game (all the gold bars) is annoying as you can't carry that many (I had a guy who was 10 str and I still only managed 3 or 4 bars) and to sell a bar will max most shops out of caps leaving you to find someplace else or just wait before you can sell another bar.
I dunno - maybe Im just a little bored of it since I played through it 3 times with different characters already. I like what they tried to do, but it didn't seem to stick throughout the duration of the DLC.
Oh and the dress - on a guy it looks like a suit - I gave one to Veronica since shes always asking for one