Brims

25 clues
Edges
Brinks
Cup lips
Hat rims
Hat parts
Derby edges
Fedora parts
Fezzes' lack
Toques' lack
Hat features
Edges of hats
Derby features
Is totally full
Overflow points
Fedora features
Fezzes lack them
Parts of fedoras
Stetson features
Overflows (with)
Bowlers have them
Starts of menisci
Sombreros have them
What pillboxes lack
Coffee-pouring limits
Projections of bowlers
Similar answers:
Abbr
Abbrev
Abbreviate
Abbreviated
Abbreviatedfilm
Abbreviatedword
Abbreviates
Abbreviating
Abbreviation
Abbreviations
Abbreviator
Abbrs
Abr
Abra
Abrabacon
Abrac
Abracadabra
Abraceofbirds
Abraceofdentists
Abraclark