If I have lost weight how come I'm still the same size?

Everyone says to me wow you've lost alot of weight and looking toned..!! I have been doing alot alot of exercise & strenght trainning....!! My bingo wings have gone which I'm pleased about "D lol!! My belly has just vanished& thankfully my have got smaller...even when I lost 3 stone before they stayed the same!! How come I'm still the same size in clothes? Apart from tops. Wear jeans ect on hips and bit bigger than I am because I refuse to ever have a muffin top err lol!!