It's not that it's a lay observation, it's that the comparison has a low sample size (one jacket compared to one other jacket, once), has no comment about how closely the two test subjects match in terms of physical properties (one jacket is not the same as another), is based on an unsupported premise (that all microgravity movements must be significantly different from 1G movements), and therefore does not lead to a scientifically robust conclusion.
Lay observations are very valuable as part of a data set, but lay conclusions lack weight without robust justifications. 'It looks like it to me' doesn't serve as a valid supported conclusion.