The Damson Madder Keisha Blouse features a wide sailor collar with contrast detailing, short puff sleeves, and a button front. The Damson Madder Keisha Blouse features a wide sailor collar with contrast detailing, short puff sleeves, and a button front. Damson Madder was born out of a desire to make exciting designs, responsibly. From their North London studio, they craft playful, ultra-feminine designs meant to be worn again, and again (and again!). Think maximal style, minimal impact.