Thank you all for chiming in. You have helped me a lot.
I have decided to keep the dress.
I agree the dress reads less like a pattern and more like a texture. It's probably as neutral as pattern can go and for now that is fine. For me it is dipping the toes in the patterns - I think anything bigger would overwhelm me in terms of how I'd feel wearing it. So, baby steps for now.
In terms of size and body con aspects, I would not change the size - this one still feels just a little fluid, smaller one would be too body con and a definite no.
Suz :: yes, the material is stretchy and it would easily go on the bike
Angie :: you have addressed the exact same thing I've been thinking about - it can be warm days dress. The fact I stumbled across it in October does not necessarily make it cold days dress too.
Also, while I know larger scale print would look great on my height, I am also aware it is hard to come across. Especially with one key thing this dress has - the length.
Which brings me to what I initially thought about the dress - I was sold on the length from the word go, so much that I was literally blinded by it and could not realistically asses whether the dress has the sort of potential I wanted to see in it and I was not sure whether I was missing to see something obviously wrong with it.
This sort of length is unseen on me in my current wardrobe and it is the length I want to wear more. You have confirmed my ideas ho to style it and I since it was inexpensive I can allow myself this indulgence to have something different I'll play with.
Thank you, it's play time now