Places like market stalls / cheap clothes shops are good for gloves / leg warmers / tutus (!) jewellery etc. Paired with things you can use again like a wide-striped black and white t-shirt or some top with a print on, or leggins etc. so you're not paying for a 'full' outfit?
http://www.very.co.uk/80s-lace-headband---pink/798119400.prd?browseToken=%2fq%2f80&prdToken=/p/prod4820745-sku7352361
is a lovely touch, esp. if you fancy a perm to go with
http://www.peacocks.co.uk/family/index.jsp?categoryId=3890061
^ few things there - checked shirt, lacy top, puffed sleeves etc. xx