Some charts are very generic and do not match real measurements at all. Very thin fabric may be fine for summer but often looks cheap and becomes see through. Smaller shops can be surprisingly friendly if they care about repeat customers. Sometimes I still make mistakes with size, so a friendly exchange policy is very helpful. Having a tracking number that works on common sites is very convenient.
If anyone is interested in real user experiences, I sometimes write short notes about the shops I test.
You can find one of the pages here:
[url=https://lifeskillsafrica.com/blog/index.php?entryid=201817]
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If many different people say the same thing about a product, it is worth paying attention. Reviews that mention long term use are more valuable than comments written on day one. I have learned to avoid items that look extremely different in every product photo. Many times I avoided a bad purchase just by reading a few careful comments. A good store usually answers questions quickly and does not hide behind canned messages. Bad lenses can cause eye strain, reflections and headache when you wear them for hours. It saves a lot of trial and error for everyone else. Nobody wants pretty shoes that hurt after ten minutes of walking.
Just sharing my personal feedback.