Pair brights with neutrals or dark shades. A hot pink sweater over camel colored jeans and brown boots is a pleasant surprise. Deep purple denim can be matched with a powder blue tank top underneath a black cardigan. If you can match vibrant jewel tones and pastels with richer colors successfully, it will make for an extremely sophisticated look.
Take those pastel shirts and summer tees and wear them underneath a slim pullover. A floral long sleeved button down shirt looks lovely when paired with a navy blue v-necked sweater. Let the collar, cuffs and bottom hang out of the sweater and wear brown corduroys to ground your look. Pick a bright color from that button shirt and carry a purse that matches. This ties the whole ensemble together very subtly and still keeps you season appropriate. Bright summer dresses belted over thick tights and a long sleeved knit top is a very cute look. Top with a newsboy cap and finish with a sparkling clutch for a pop of glam.
Still intimidated? Well styled accessories can be incorporated into autumn outfits to give them a new breath of life. Statement necklaces worn with knit sweaters can add some pizzazz to an otherwise boring outfit. Stacked rainbow bangles over a black long sleeved knit tee add a sharp and delightful contrast. A mustard yellow clutch bag worn with a chocolate brown scarf and beige jeans is especially striking. Or a deep maroon coat can really pop with a vibrant blue scarf. Your shoes and belt can also add a little bit of bold to otherwise plain outfits.