Angie, thanks for chiming in. I am quite thrilled you think they are ok for casual.
And Sarah, that's pretty much how I envisage wearing them. However they are not shearling lined, just trimmed so they are not any warmer than a regular boot.
I went and tried them again and I have left them... for now.
I ended up buying a pair of lace up light ankle boots with a wooden heel. These would be great for work and casual and will go with pants/jeans & skirts. So I think they fill the hole I was wanting to fill (and they are returnable if I get them home and think 'no'.) I will take pics to show you tonight. I can afford both, so I may sleep on the shearling boots and see how I feel about them tomorrow.
Thanks everyone for your thoughts it has been so helpful.
And just to explain my indecision over these, shearling lined boots can look like slippers that a certain demographic wears (outdoors - similar I guess to the Ugg boot) in Australia. We refer to 'bogans" which might be similar to the term 'red neck' - I trust I am not offending anyone. It is used in good humour to describe someone who has no style and is pretty rough around the edges but not in a good way.
I would love to know what my Aussie YLF friends think of these:)