Knickers that don't fall down

[waternfire]

Is it just me, I find my knickers are always falling down, from behind! It's the right size for me, no issues with it being too tight or loose. It's the most frustrating thing ever, I'll be walking and I can feel it's almost half way down my butt! Even when I sit down it will go down.
I tend to prefer mini briefs, I don't like anything high waisted. I feel like if my bottom was smaller I wouldn't have this issue? I must add my bottom isn't so huge or anything.
Is it the quality fo the knickers?
I've asked my sister who said she has not experienced this

Mini briefs are not suitable for your shape thats why they keep falling down.

The only way to stop this in my experience is to go for full briefs

They must be the wrong size if just walking makes them fall down. They're either too loose so not getting enough purchase around your hips, or they're too small and not coming up high enough. Try a different style.

I’ve never had this. Are you sure you’re not buying them too big?

Or are you buying really cheap pants?

I've tried full briefs, in a few sizes, they all feel too big, like excess fabric, I can feel the fabric rubbing against my skin. Maybe it's the particular ones I bought.

They're obviously not the right size if they're continually falling down 🤷‍♀️ Or the wrong cut for your shape.

Personally my utter favourites are Sloggi maxi briefs, fit me perfectly.