TwoHandedSword: The Enchanted Gown (aka the "Sunday Best" dress) gives others a +20 reaction bonus toward you, equivalent to a +4 boost to your Beauty.
I was unfamiliar with this item so I just googled it. I found a page that lists the Enchanted Gown and the "Sunday Best" dress as being two different items with different stats. Is that true? Or are they the same?
(Sorry for not giving more info, I'm trying to avoid overt spoilers about the stats... I can elaborate if asked)
EDIT: I decided to proceed with spoilers....
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SPOILER WARNING
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If the site I found is correct, then the Enchanted Gown has a +10 noise penalty (NP). Confusingly, positive NP means it makes you QUIETER (for example, plate armors often have NP of -80 or so, they're super loud). So that makes the Enchanted Gown really useful for sneaking around. With high magical aptitude, you will also get up to +30 fire resistance, which is nice. It's no good for blocking direct damage, though.
The "Sunday Best" dress is the one with the reaction modifier. Enchanted Gown doesn't have that, but I'm guessing everyone was gushing about it because of how helpful it is when prowling. It's the only item I've ever seen (OK, technically I've never seen it, just looked at it online!) that actually improves your noise penalty.