Need help with lingerie

I have ordered an teddy before of love honey and i returned it and ordered the bigger size now i am stumped in what size to get i am 24 and normally 18/20 size 36 f bust, 5ft 1 and i got the 3x/4x. But the 1x fitted last time it was just the bra didnt reach my boobs thats why i got the bigger size, do i go for the bigger size 3x/4x or go with the 1x? Thank you x