Looking for where to purchase actual stylish clothes in the UK

Hi, i'm asking for advice really. i am looking to see where i can get actual stylish clothes and nice fits. instead of having to buy t shirts as long as nightgown to fit my stomach. i am a 5xl, i'm a big guy 23 stone ( was 29 back in july so definitely working on that) but now i'm feeling better about myself i would like to dress to reflect that. Seen a lot of great fits on here and just wanting to know where you find them?