I thoroughly tested this shirt during a weekend trip to Croatia last weekend. And I think it is perfect.
It has long zippers that aren’t very visible while wearing. Enough space to breastfeed with larger breasts.
Tested in an airplane and on a terrace. I’m sold. Buying other colours as well.
Only remark: expected to have a wider fit and that the material would be a bit softer (more towards the baby zipster).