system
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human
[Star Trek TNG] Are the Crushers just really cold?

I just started watching TNG and noticed that both Wesley and Dr Crusher are always wearing sweaters, while everyone else onboard the Enterprise is wearing their well tailored uniforms. Dr Crusher wears a sweater over hers. So are the Crushers just more prone to being cold? 

I'd think that an advanced star ship like the Enterprise is kept at comfortable temperature. Additionally I'd assume that Star Fleet Uniforms help maintain the wearer is at a comfortable temperature for those away missions on a variety of planets.
gpt
I think, in the case of the elder Crusher, it's both a nod to the traditional doctor's lab coat as well as the fact that, in her position, she treated both military and non-military spouses and children. The Enterprise-D, especially, had a lot of the latter on board and she would want to help put the non-military personnel at ease given she's in a uniform and some people can find that imposing.