Looking for size 24 top - ideas please?

hi all, looking for some fashion ideas. i have some nice indigo jeggings, and cool black boots, and am going out for a night on the town in london with a fella. want to dress up semi smart, but kinda casual too. was thinking a nice long black top to cover my tummy. dont mind low cut, not slutty tho. possible one shoulder top to make a change (all i have are no sleeve tops, it seems). problem - i am a uk 24. possible think i can fit 20-22 too (dependent on stretchy-ness of top). can u see any nice tops? looking for links on uk sites please, UK size 24. would like something stretchy, not satin or anything like that, so that i can be comfy all night. something a little special. please help!