Whistles blazer in excellent condition, size 6

I am reposhing this blazer that I just purchased and received yesterday. It’s beautiful and in excellent condition, but, unfortunately too small for me. Even though I wear size 6 and this is the same size, it’s too small. I should have realized that different brands look at sizes differently. If interested, I will post the measurements. It’s grey with stripes and blue inside. You can pair it with all colours.