To obtain the Fashion Victim achievement you have to collect and also have in your inventory every piece of clothing in Fable 3. Depending on your character's gender, there's a couple outfits that must be traded for to acquire, but otherwise most can be bought in shops across Albion.
There's also a handful of clothes provided through DLC in Fable 3 and they are not required for the Fashion Victim achievement. They have thus been excluded from this guide.
The very first clothing store you'll visit in Fable 3 is Frou Frou Frocks in Brightwall Village. You will find a number of matching sets of clothes sold here, and they're the following:
The following aptly named clothing shop is Bower Threads in Bowerstone. You will find six more sets of clothes to get here.
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In Aurora there is a clothing store called Robes Are Us that sells two magic themed outfits.
You will find four sets of clothes which are related to in-game quests, and they're the following:
Whenever you become Ruler of Albion within the second half of Fable 3, you're granted a special group of clothes to commemorate the occasion.
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