In my experience 3T and 3 are close to the same size as well as 4T and 4. With some brands they are identical (in weight/height measurements anyway), and some like Carters are slightly bigger without the T.
Annalise Marie 05.29.06
Charlotte Ella 07.16.10
Emmeline Grace 03.27.13
Re: ? about child sizing...
depends!
In "rise" is usually shorter in the big kid section in the 3/4 + size.
The rise is the length from waist to crotch and if the kids is still in diapers it would fit different.
Charlotte Ella 07.16.10
Emmeline Grace 03.27.13