Prague in March is indeed chilly, but it’s also a wonderful time to explore the city with fewer crowds.
Statement Coat - A good quality wool coat in a classic cut is both warm and stylish. Think Camel, Navy or even a checkered pattern for a bit of an edge. A trench coat with a warm lining could also be a great choice.
Layering pieces - invest in some quality knitwear - turtlenecks or cashmere sweaters in neutral tones like grey, black or crea.
Stylish Scarves - add colour or texture with a scarf. A large blanket scarf maybe.
Ref. the bag: Prague is a great place but renowned for pickpockets, particularly on the Charles Bridge and in touristy areas, where they operate in groups and pass the valuables to each other.
I personally would wear a small bag for essentials with zip fastenings INSIDE my coat or a bum bag I can keep to the front of me. You and your husband should not keep anything valuable in your pockets, particularly jean back pockets, as these are easy to access.
Only take out the money you need for a day and keep a close watch on your mobile phones. Maybe leave the expensive watch behind too.
Sorry for the tone, but a friend of mine was pocket-picked on three consecutive days and it ruined his holiday.
Perhaps your husband could wear something like this under his jacket and wear it to the front, not the back.
Greetings from Prague
We will be slowly moving from sleeping bags and woollen coats to thiner layers.
Spring coat or thick blazer and scarf with layers under, keeping alpaca or cashmere or merino sweater on you mornings and late afternoons, during the day eventually not needed. Then bodyhugging layer or shirt with top under.
If you wear skirts, then longer boots still good choice. If trousers or jeans thicker fabric and popular straight fit here with shoes or trainers (yes Sambas are the most cool these days, lol).
Jewelry - yes to. Mainly rings still in March well visible on the streets.
When it comes to bags, crossbody and backpacks you can see everywhere.
No need to be too scared of pickpockets as much as written in the other comment. Even yesterday we were on the Charle’s bridge and I would just be careful as in every other big city, when it is crowded.
Hope it helps, too.