This extract from Google Books is about Cecilia Costello and what she said about Peaky Blinder clothing    https://books.google.co.uk/books?id=1y2qDwAAQBAJ&pg=PT74&lpg=PT74&dq=My+bloke%27s+a+Peaky,+None+the+worse+for+that.&source=bl&ot
It also suggests that 'daff' might be 'dell' or daffodil.