Welcome to rootschat sugartea.

Newspaper reports usually describe wedding outfits in quite floury language and include lots of detail. It may not be the case during war time, and as your grandmother is wearing a smart outfit rather than a traditional wedding dress, detail may be less. I don’t have access to newspapers but maybe someone who does can dig up some examples for you.
They may describe the style of outfit, the fabric, the flowers used in the bouquet/buttonholes, colours of everything, attendants - their names and what they wore, the regiment etc that the husband was in, where they went on honeymoon (probably not during war time), the church or register office where they married, information about the wedding breakfast - where it was held, and what they ate, other family in attendance, and their names - basically anything and everything.
Regarding the description of your grandmother’s outfit, I might leave that to someone else, but it looks like she might be wearing a “dress coat” - (unsure if that is the correct term).
