*Disclaimer, I haven't tried any super pricey boutique/designer brands.
That said, I'm all about extending the life of my regular pants and jeans. Most low rise cuts fit the whole time no problem, but some of the ones with higher rises can still work! Just loop a hair band through the button hole and put around the button! If you're wearing a top that's not quite long enough to hide your little secret, or, like me, your underbelly skin is just sensitive some days, just take a belly band (grab at Target or Motherhood for pretty cheap!), pull up onto your hips underneath pants, fasten pants and fold the band down over top!
Blouse: J. Crew, Pants: H&M, Necklace: NY&Co, Boot: DV via Nordstrom, Coat: Motherhood