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Baggy clothes don't look good on anyone! They make people look especially shapeless.

Foundation garments and basics. If you don't have a well fitting bra and underwear, everything you try on will hang oddly. And, even if you have very small breasts, never go without a bra. You should also have some staple things in your wardrobe that you keep even as trends change.

Stretch fabrics can be okay but the percentage of elastic must be very slight. Clothes with too much stretch will lose their shape over the course of the day.

Try out many lines of clothes until you find something that works for your body shape. Since there are no standardized measurements for clothing, a company may make clothes that just aren't cut for the way you are proportioned. For example: one jean brand may have a four inch difference between their waist and hip sizes, while another could have six or eight.

However, if you like something that doesn't fit right, don't be afraid to go to a tailor. Buy a size up, and a tailor can trim off the extra material so the fit is specialized to you. If you're short and a company don't make a petite line, you can also have clothing hemmed (this is a problem I have a lot.)

Layering clothes can be fun, but you have to use lightweight fabrics when doing so. Too many heavy fabrics will be bulky and make you feel uncomfortable and look bloated.