You can't go wrong with something understated and modest in grey and/or black. Does a Jewish funeral have different rules? I would have thought not.
If it were me, and the weather was to be mild, I'd wear a charcoal skirt that covers my knees, a black long sleeve blouse, hose and dressy (but not flashy) black pumps with heels that are not too high or skinny, because sometimes you have to walk across the grass or stand by the side of the grave for the service. I'd forgo jewellery (except my wedding rings and small silver earrings that I never take out), and do simple makeup.
If I had a black suit, either pant or skirt suit, I'd wear that.
I am sorry for your loss.
