Not quite old enough for the 50s but remember the imitation Christmas tree with branches like bottle brushes that just stuck out. Didn't look at all realistic.
Baubles that broke really easily, tinsel that tarnished, plastic snowflakes where 2 interlocked to make them 3-D and similar type of other tree decorations with toys in a ring. We also put lametta on our Christmas tree. We've still got a golden nutmeg tree decoration from then that we put on our tree each year.
Tree lights where you had to get a special bulb to make them twinkle.
Christmas stockings (probably Cadbury's) made out of white netting trimmed with crepe paper.