Cloth diaper covers can be really cute for photos, like baby's first Halloween. If you have the money and desire to get themed covers, go for it! There's some really cute holiday covers on Etsy and Hyena.
However, if you're on a budget like we are, you won't have the money to do that. It's not financially savvy to get covers just for holidays since you won't use them very long, but thinking creatively about how to use the diapers you have already for costumes can come up with some really cute pictures.
This little fluffy butt is wearing an Eco Posh fitted bamboo diaper with an upcycled green wool cover from a WAHM on Etsy. My beige colored wool cover would have worked well too. These wool covers were only $12 (plus shipping). They don't need to be washed after every use and they're super soft. I love wool covers. She'll probably be good in this combo for the next three hours, plenty of time to get good shots of her first costume.