I've searched Google for Spada, and just to be clear, it is motorbike clothing
For a short straightforward walk in summer you could wear just about anything, though depending on how heavy or close fitting the trousers are, you might think about swapping them for something lighter, even jeans
Still, there's only one way to find out - off you go, and if you want to do more, you can build up from there. Have fun!
What sort of footwear are you using? I can imagine motorbike boots being heavy & uncomfortable for walking. If you haven't got any trail shoes or light hiking boots, trainers would be OK
I've had several kinds of trousers for hiking, but now I mostly use a couple of sports/jogging type pants. One has a mesh lining, the other a fine brushed lining, like very thin fleece. I got them both from charity shops, for £2-50, and about £5. They're excellent - comfortable, warm, and quick drying