Does your vagina have a smell by the end of the day?

Do I have to have an STD for my vagina to have a smell by the end of the day?

I just took a shower this morning and went to work (I work at a beauty supply place) and tonight when I got home, I took my pants off and I sorta smelled something so I rubbed my hand on my panties and it stinks. I'm not even sure how to describe the smell.

I notice that when I wear leggings, I smell even worse?? WHY?

Is something wrong w me or is this normal?