Anyone advise where Frugi compares to size wise please?

[maxybrown]

DS is average height and very very slim but I like things to have growing room never bought frm Frugi before and am looking at mainly tops and wondered if anyone can tell size wise where tehy compare to? looking at around 3/4 year mark. He is 3 and a half and 3/4 too big some places but fine others!

oh and because there is a top in the sale I would like to keep for next winter so not sure wether to get 3/4 or 4/5! He generally needs a longer body!