Go for one statment pastel piece or mix different pastels for a more daring colourful look.
Here's some outfit ideas for inspiration (All high street of course!):
As mentioned on AoT before, try not to go for one pastel with all black, so 90's! Stick to pastels and light colours (grey/white/denim) for a modern pastel look.
Give it a try, a palette of ice cream sundae shades awaits!