For example; the mod style of clothing was meant for a very slim, boyish body type like it's spokesmodel Twiggy, so it is nearly impossible to find skirts or pants from this time to fit a body with any hips whatsoever (and that means most of us).
Here is the basic woman's body shapes and the era's which best suit them:
Pear
A-line dresses circa the 1960's can be very flattering on pear shapes, just watch the length and fabric type. Avoid heavy fabrics and lengths that fall anywhere between the calf and knee. Longer skirt style like those of the 1970s combined with a fitted top are a great fit, but not the hip hugging bell bottom styles of the same decade.Hourglass:
The 1950's LOVED a shapely hourglass figure like Marilyn's. Cinched waists, snug cardigan sweaters, and hip skimming capri pants or pencil skirts make an hourglass figure look its best.Apple:
With a sizable bust and shapely legs, pick one to show off. Any decade that doesn't emphasize the waist will look great on this body shape including the 30s, 60s, 70s.Rectangle:
1930's flapper styles, 40's wide shouldered suits, and straight 60s mod styles were made for this body shape. Any waist or buntline emphasis will backfire on this shape, so avoid 60's and 80s shapes.
The best tip for plus size vintage clothes is to try them on, and if that is not possible, measure them and know your measurements. This is the best way to get a flattering fit regardless of you size or body shape. Knowing your measurements will also make it easier to buy vintage clothes online and be assured that they will actually fit.
Another tip for plus sized vintage shoppers is to look for labels with a 1/2 size. Half sizing is how plus sizes were originally labeled.

