Thanks to @Kronin there is a nice list on DOAW displaying all of outfits that will be available in Last Round from previous games:
DOA5:
DOA5U:
I do not like this method of costume distribution. There are some "free" outfits here, but if you bought them already you feel like it wasn't for much of a reason, and if you never bought them you have to wait a year and some change for a partial collection. Why not put all this effort into original content?
Source:
Team NINJA
DOA World
			
			DOA5:
- Player's Swimwear
 - Hottie's Swimwear
 - Santa Costumes
 - Cheerleader
 - Round 3 Costumes - Unforms
 - Round 3 Costumes - Gym Class
 - Round 3 Special Costumes
 - Costumes Pack Round 1
 - Kitty Pack
 - What a Character
 - Special Set
 - Angels
 - Devils
 - DOATEC Divas
 - China Pack
 - Special Set 3
 - Formal Wear
 - Fighter Pack
 
DOA5U:
- Legacy Costumes
 - Sports Gear
 - Intimate Costumes
 - Warriors Orochi 3 Ultimate Costumes
 - Casual Collection Vol.1
 - Casual Collection Vol.2
 - Santa's Helper Costumes
 - Yaiba Costumes
 
I do not like this method of costume distribution. There are some "free" outfits here, but if you bought them already you feel like it wasn't for much of a reason, and if you never bought them you have to wait a year and some change for a partial collection. Why not put all this effort into original content?
Source:
Team NINJA
DOA World
			
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