I get it. We all see that perfect jacket online—the one that looks vintage, loose, and effortless. For me, it was that specific Women'S 2022 Spring Autumn Black Khaki With Belt Loose Jacket Coat. It looked amazing on the model.
I thought I knew what I was doing. I didn't. I made five basic mistakes that turned a great shopping idea into a huge fail. I made these mistakes so you don't have to ruin your look or waste your money. Learn from me.

Here are the key benefits you lose out on if you buy wrong:
I saw two long blazer options that looked almost the same. One was $90. The other was $35. I chose the $35 one because I wanted to save money. This was a big mistake.
When the cheap one arrived, it was not a heavy coat. It was thin. It felt like paper. It had no structure. The vintage look completely disappeared because the fabric was so flimsy. A cheap price often means the fabric is too light to hang right.
The description said "polyester blend." I did not check the weight or the lining. I assumed it would be fine. Don't make my error. When you buy outerwear, the material matters a lot.
My cheap blazer was unlined inside. Unlined blazers look cheap and cling to your shirt. It also wrinkled if I sat down for five minutes. If they do not list the exact material content (like 50% Wool/50% Poly), assume it is 100% cheap plastic poly that will pill up fast.
What you need to check for:
I looked at the star rating and saw 4.5 stars. I thought, "Great! I'll buy it." I should have read the actual words people wrote. I should have looked for the two-star reviews.
The bad reviews always tell you the truth the seller hides. For a structured piece like a suit blazer, look for comments about the stitching and the belt. For example, if I had read reviews, I would have seen: