Old Navy bottoms for $9.99 OR LESS (reg up to $25)! The lounge and sleep pants are only $8! They all come in other colors and prints too. (commissioned links)

High-Waisted Thermal-Knit Jogger Lounge Pants — https://shopstyle.it/l/btQMZ
High-Waisted Sunday Sleep Ultra-Soft Jogger Pajama Pants — https://shopstyle.it/l/btQL4
High-Waisted Balance Yoga Leggings — https://shopstyle.it/l/btQL2
High-Waisted Balance Twist-Hem 7/8-Length Leggings — https://shopstyle.it/l/btQLZ