Christopher Esber Reversible Negative Space Sweater in Green. - size M (also in ) Christopher Esber Reversible Negative Space Sweater in Green. - size M (also in ) 70% angora 30% nylon. Dry clean only. Fuzzy knit fabric. Back cut-out. CHRR-WK1. F17K02B. Established in 2010, Australian designer, Christopher Esber created his eponymous label with a distinct woman in mind. I design for a woman who loves fashion but she is not willing to surrender herself to it. says Esber. A strong background in tailoring has allowed Esber to combine structurally, masculine pieces while mixing feminine fluidity resulting in a luxurious yet easy to wear approach.