All you need to do is abstain from the moment you open your eyes and the moment you close them today . Then reflect , and repeat . Soon you ' ll find the number starts to build . You ' ll get through this , I won ' t drink with you today . <| sep |> Yeah I would be terrified of messing up this next section . <| sep |> I don ' t have strong recommendations , but maybe a couple of comments . First off , a tuxedo , or what you call a dinner suit over there , is really meant for evening wear . If you ' re having a daytime wedding like most people , it might not be the first choice . If you want formal or semiformal in the daytime , strictly speaking that means morning dress or stroller coats and the like . Those are usually only seen on undertakers and Ascot attendees , and they ' re IMHO very nonversatile garments . You might wear it once . So if it ' s a daytime wedding , think about a really nice business suit , navy or midgray which the English still call a lounge suit . You should be able to get something excellent within your budget , and you will wear it many , many times over the next decade . Where to buy ? I used to live in London years ago , but I don ' t have any suggestions . The fellow below who said you should just go to Jermyn Street is all wet , or at best he simply doesn ' t know . Of course , you don ' t have time to get Savile Row bespoke , and in any case , topflight W 1 tailors would be well out of your price range . That said , they they would make you a suit which you would hand down to your son in fifty years . Find someone you know locally or at your work who ' s a really good dresser , and ask for advice they ' ll probably be happy to talk about clothes . If it ' s a December wedding , time ' s running out , and you will probably need to buy off the rack . Good luck ! Tell us how you get on with this .