@Feisbukaite That looks like something that was overlooked during the development of the Seasons pack. I wonder if the developers are aware of this. I find it hard to believe this was by design because it would be nearly impossible to keep your athletic sims alive if you play rotationally. It would be too hard to remember to change everyone's workout clothes each season.
I think they're working on a patch to fix some of the bugs that came with Seasons so maybe @SimGuruNick and @SimGuruArvin should be made aware this is happening.