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The hottest trend for blazer this season would definitely be the one with contrast piping. Blazer in black with white piping. Looks very edgy, sharp and chic. When I hit Topman last 3 weeks, I know I've seen the exact designer one. And yes, I'm right. It's Dolce & Gabbana's.
While Dolce's may cost me a merely weeks of rent to pay for, the one by Topman doesn't break the bank that much. Perhaps, it's a fraction of the price. Overall look is similar. The only different might be a bit on the lapels. And the fabric; Topman is a polyester/viscose mix while Dolce & Gabbana's is satin. And, River Island also copy similar look, but theirs is in grey (with white piping).
Btw, both are deliciously edgy!
Dolce & Gabbana (L), Topman (R)
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