TU check wool style coat size 16

TU wool style coat in a grey, peachy pink, and light tan brown beige check - size 16. Although a wool style coat it's quite lightweight as unlined and doesn't fasten it just has an open front. Perfect for autumn / spring transition weather, I can imagine just throwing it on over a cute jumper and jeans too run errands. I'm going to be totally honest with you this was an impulse purchase because it was the last one in the shop... But it was a size too small - I was like it'll be fine I'll lose weight and it'll fit! I lost weight so it would have fit... But I'd forgotten I had it and now I've put weight back on so now it's too small again. Honestly gutted! I'm so tempted to keep it in a it'll fit one day but I'm trying to downsize my wardrobe! So it's brand new just been tried on a few times - without labels, sadly never worn just sat in my coat cupboard for 2 years 🙈