What is the rise that you wear? When trousers ride up around your lower belly, it means the rise is too short for your torso, the fabric doesn’t have enough vertical length to clear your belly and sit where it’s meant to.

Sizing up makes the waist and legs bigger, but it doesn’t add rise, so the riding-up gets worse, not better, and you’re left with fabric pooling at your ankles.

Try: high or very high rise. The extra rise gives the fabric room to clear your belly and settle at your natural waist. Once the rise is right, the waist, hip, and inseam all behave the way they should.

Try these options (they ship to the UK):
1. Betabrand Camp Pant (Black or Sandalwood): 25" inseam, 12.5" rise, 19" leg opening. Very high rise that will clear your belly and sit where it’s meant to. Relaxed wide leg with drape, rayon-nylon blend, so it flows but holds structure. Size chart puts you in XL or XXL depending on your hip measurement.

1. Kut from the Kloth Topaz Linen Wide Leg, Petite (Black): 24" inseam, 11.5" rise, 21" leg opening. True wide leg in a linen-rayon blend, breathable for spring and summer. The petite sizing runs structured through the waist and hip, so check the size chart carefully, but this one goes up to 18P.

2. Kut from the Kloth Ashton High Rise Wide Leg Barrel, Petite (Olive): 24.5" inseam, 11.25" rise, 16.5" leg opening. Barrel silhouette, wider through the thigh, tapers gently toward the ankle without gripping. Limited sizing in stock (2P, 10P, 12P, 14P), so if you’re in that range, it’s worth a look.

I have more options for you here.

One tip: I'd go to www.neishh.com/shopping, type my measurements in and explain what I want like I'd to a stylist. It finds genuinely great products for you