On closer inspection I realised 2 things. a) I had forgotten to sew the velcro on. I was so fixated on getting my applique neat that I forgot all about fastenings - I didn't even cut the velcro out and forget to sew it on, I just forgot about it all together. Grandma pickledweasel is coming round today with her popper putter inner to help save the situation.
b) My topstitching hadn't closed the seam it was meant to. I left about a 3" gap at the bottom of the bib when I was sewing the front and back together, so I could turn the bib right side out. Rather than close it with invisible stitch I thought it would look nice with a line of black stitch round the edge, plus it's really good practice for me and my wayward sewing machine (I tend to go round corners a bit fast). Anyhoo, I didn't sew close enough to the edge. Pah. I'll have to invisible stitch it after all.
Never mind. Practice makes perfect, yes? I'm still liking the pears. I handprinted them with a print block I made yonks ago. I think the spotty fabric is perfect for them.