By rights I should love this Celia Birtwell dress, the print's fab but the cut is awful and it's completely transparent, but it only cost £3.80 from a charity shop so I tolerate it.
I rock it up with my favourite vintage leather jacket, shin-length leggings, ankle boots and heaps of ethnic jewellery. The holdall is leather with silk paisley-covered panels - ideal for carrying my swimming gear and a snip at 25p.
When I'm second-hand shopping I try to think creatively - pattern and fabric is far more important than size. If it's too big don't dismiss it -belt it or a wear with a tight waistcoat, fitted jacket or shrunken cardi to create shape and interest.
Remember that vintage dress sizes are significantly smaller than today's contemporary clothing sizes - a 1970's size 12 is more like a modern day size 8. Bear this in mind when trawling eBay's vintage section - if the measurements aren't given in the listing ask before bidding to avoid an expensive mistake.