Moss London Slim Fit Neutral Lightweight Jacket

I picked out a jacket that I wanted for an event at the end of the week and a sales assistant helped me with sizes and alterations. I thought the size they picked out seemed to small on me, especially when they pinned it, but they insisted it was a good fit. I came back 2 days later excited to collect but I tried it on and it looked awful - it looked like I had a children’s jacket on and I could barely button up! I explained to a different sales assistant and they offered to have it re-altered to allow more room. I come back 1 day later and the jacket is still too small. I had no option to take it because it was the day before my event. I trusted the sale’s assistant’s expertise and it wasted me £130 and took 2 days of visiting Westfields