The collections are based on the hair types and the many hats. If your avatar has that hair type (color doesn't matter) or helmet then your avatars will be in that collection. Collection 1 is the collection without hair or a helmet.
1 | 2 | 3 | 4 |
5 | 6 | 7 | 8 |
9 | 10 | 11 | 12 |
13 | 14 | 15 | 16 |
17 | 18 | 19 | 20 |
21 | 22 | 23 | 24 |
25 | 26 | 27 | 28 |
29 | 30 | 31 | 32 |
Other | |||
33 | 34 | Other |