The hatinator bases seen above are worn on a headband. A hatinator is a hybrid of a hat & fascinator. Typically a hatinator "base" will have a shallow crown, hence the reason for a headband to securely keep it on your head.

Brim sizes per hat base (in inches):

Harlyn: 18.25"

UM7: 17.25"

UXXL24:

UXXL2: 19"

UXXL16: 22"

Henley: 18.25"

Jan: 20"

Oprah: 20"

Wide-side: 21.75"

UXL1: 17.75"

UXXL15: 21.75"

Harlyn: 18.25"