Not a windup, MN regular, NC because embarrassing 
I’ve noticed some knickers are quite slim fitting in the fanjo area. The bum and the front fit fine but the actual fanjo bit seems quite narrow, and my lips often slip out, like half of my fanj 
I’m average height and weight and had this all my life, just with certain brands (H&M, M&S). Don’t think my lips dangle or bulge more than any others I’ve seen (not that I’ve seen many but enough?) Made me wonder if I’ve got a wider fanjo than average or do others have this too?