1) Create a color balace- avoid wearing too many colors you dont wanan look like a rainbow.
2) Dress Minimal- overdose of design, cut and stitching details or a lot of flare will kill your look. A subtle details like fancy buttons or a keyhole at back works just fine.
3) Say no to heavy accessories- Too much dressy with over loaded accessories is a strict no especially with western wear.
4) Minimize the use of Makeup- keep it central and grounded, over use of makeup is a big turn off and kills your outfit as the face becomes the centre of attraction.