Now I would like to offer you mouse costume idea for you children.

Sew the sarafan from the material of grey color, heart-shaped breastplate and pockets on skirt. Decorate a breastplate with mouse-shaped cut-outs or embroider a mouse in satin-stitch. Also you should trim with lace a breastplate and pockets. Decorate a skirt with tinsel and spangles. The bottom of the skirt decorates with downy ribbon of grey color.
Ok, now sew the cap from the material of grey color and fix the foamed polyurethane into the ears of the cap. Your kid should dress up the rose-colored blouse under sarafan and grey-colored tights on legs.

That's all. Wish you and your children Merry Christmas and Happy New Year.