Yes it's okay to skip taking a shower for a day or every other day.
I personally only shower once every other day unless I'm dirty or smell bad from doing something outside etc.
If I'm not really dirty and need a shower that day or night then I will wait a day and then shower then.
Showering too often can actually dry out your skin so your skin will stay healthier if you do skip a shower here and there.
It's not necessary to shower every single day unless you're really dirty and need to get cleaned up.