Bounce rates and very low conversion rates

My site seems to be producing very high bounce rates (60% plus) and because of this the conversion rate suffers massively.

Here is a users journey:

They search for '80s fancy dress' in Google and enter the site through an Ad. They land on this page costumecrowd.co.uk/80s-fancy-dress/ scroll to the bottom, back to the top and then bounce.

Now I understand it's very possible they just dont see anything they want, but the range is quite large and other pages much larger.

So my questions is: What things could I try to lower bounce rates with the current product range? If I can get some direction I can go ahead and split test ideas, I just need some expert advice on problem solving this issue.

I have heard 'product reviews' play a massive factor so maybe this might help?