Bloomers — lower garments (8)
I believe the answer is:
cowslips
'bloomers lower garments' is the definition.
I can't tell whether this defines the answer.
'lower garments' is the wordplay.
'lower' becomes 'cow' (something which lows - makes cow sounds).
'garments' becomes 'slips' (slip is a kind of garment).
'cow'+'slips'='COWSLIPS'
Can you help me to learn more?
(Other definitions for cowslips that I've seen before include "pretty yellow flowers for unsteady bovine" , "Wild yellow flowers for unsteady bovines" .)