Well, I'd pack a couple of pairs of skinny jeans, plain long sleeved tops and light weight cardis. Pick a couple of scarves which match several outfits. You may get away with summery skirts later in the month. I'd say ballet pumps or similar as it's likely to be too cold for open toes . I'd probably also pack a couple of light weight sweaters. I hope this helps, have a good trip.
Yes to skinny jeans. Tops could be anything from Breton style tops to fine knit wool jumpers (in spring colours) to t shirt with a cardi (fitted cardi again spring colours)
Colured skinny jeans have been popular over here. It depends if you're a colourful sort of person. I don't suit them but have two friends who live in coloured jeans and look fab.
I will probably be shot for suggesting this but have a look at Boden, White Stuff websites for inspiration. Or Toast and Whistles. Boden and WS are very sahm and toast and whistles are perhaps a little trendier. Also look at White Company website. Very sahm relaxed style.
So: skinnies a fabric biker maybe a couple of skirts (maxi?) with a denim jacket? Converse, maybe some ballet shoes lightweight scarves cotton jumpers or cotton sweatshirts maybe a light cropped trench coat? brolly!