Have you ever underestimated the size of a toy & bought it only to look at it like O_O when it arrives? I have. Cole Ryder sensafirm dildo. I believe it's 2.25 inches of girth.
Hubby just reminded me of a toy I bought from a catalog...years ago. Looked really long and slender. Indeed, it was LONG...like a YARD long, and slender? Well, maybe for a baseball bat! Sure, some woman may actually use such toys, but for me, it was like a novelty/gag toy. About the size of a LARGE anaconda snake. Hubby rubbed the head of it on my clit for about a minute, then threatened my little butt with it as a joke. It then sat at the bottom of our toy drawer, taking up space for about two years, till the Jelly it was made of started melting, giving me the excuse I needed to toss out that expensive, and useless "toy". (The description in the old catalog did NOT give measurements, by the way...just a photo that made it look a half inch around, not FIVE INCHES around!!!! How NICE it is to have EF and the INTERNET now.
I usually check the view actual size thing on every single purchase, so it's been a very long time since I visualized anything wrong, and I've never bought anything I couldn't use, fortunately.
I do have one toy that feels bigger than others of its size, and in the opposite way one would expect. I actually haven't used it in a good long time as a result. It's a soft silicone toy that measures no bigger than three other toys in my collection -- one of which is metal. But for some reason, it's the softest toy that feels uncomfortably big to use. It doesn't have texture, either, and I have no idea why my body objects to it.