well bum bags??? they may appear on the cat walk but in reality you'll just look like a tourist even if your only popping to the shops! Theres quiet a few trends this summer, i'd say the hottest one that appeals to every woman/girl/teenager is the maxi dress, teamed with the hottest tribal patterns ( zoomed in tribal patterns are the development of last summer) think of an African summer night for a colour pallete, burnt oranges, beige brown rusty yellows.
Country Western is also HOT this summer the key to pull this look off is layering softer fabrics under harder ones, such as gingham shirts under a denim waist coat, high waisted shorts and some wooden wedges. I could go on for hours ! check out vouge UK or WGSN ( World Global Stlye Network) for more ideas and inspiration.