When it comes to clothes at Muslim funerals, the general concept is modesty and simplicity, and this applies to both men and women.
So, men will be wearing loose-fitting trousers and shirts. In some parts of the world, they’ll be wearing kaftan or other traditional clothing.
As for women, they should wear tops with loose cuts that have high necks and long sleeves. They should also wear flowy, ankle-length skirts or dresses. As a general rule, all garments should be opaque and plain. So, no see-through or mesh tops and body-con skirts or dresses.
Even if the woman isn’t a hijabi, then she should still follow these rules. Moreover, she must cover her hair with a scarf for the duration of the funeral, or at the very least, during the Janazah prayer. Men can also cover their hair, but it’s not obligatory.
A thing that people often forget is socks. Since all funeral-goers will take off their shoes when they pray, you need to pick socks that suit the occasion. So, don’t wear thread-bare socks or ones with holes. Also, pick neutral socks with no patterns or bright colours. Think plain black, grey, navy, or white socks.
As for colours, it’s customary to wear black. However, this isn’t a requirement. You can wear other colours as long as they’re not too flashy. But you should avoid patterns that’ll make you stick out like a sore thumb.
So, if you don’t have black, conservative garments in your closet, don’t sweat it. Any subdued colour should be fine, like grey, navy, brown etc.
Basically, make sure your outfit is simple, plain, dark-toned, and, most importantly, modest.