Each and every person is of different shape and size and they have to adapt the style according to it’s individual body type.If one is of a plus size body type they should certainly keep some points in mind.

Now, most of the people would suggest you to wear cloths which will make you look thin. And if you are looking for an answer kinda like that, I WON’T give you your desired answer.

Look for shirts that have darting or shape to them so they skim your body.

For pants, choose a straight-leg, bootcut, or tailored look. However, avoid a relaxed fit or trouser pant.
For underwears,plus size lingerie may be a good choice.
For skirts or dresses, look for pencil, a-line, or fit-and-flare options.
Baggy Clothes. If you are a plus size woman, the first thing that you should stay away from is baggy and unflattering clothes. ...
All Black. Stay away from monochrome outfits.

Plus size clothing is one of the toughest to shop as there are very limited options so if you are out to shop for plus size clothing then you need to follow some tips and that tips are:
Look for Options
Look for the designer
Come out of your comfort zone
Do some research
Work on detailing

Lastly, when buying plus size clothing be confident and yourself. And, most importantly, believe that your size cannot stop you from looking glamorous.