For HappiestWorld, I like to take and list the measurments of garments layin flat. 

Doing it like this makes it so one can go off the measurments of things they already have and love to wear and compare them to the measurements of the garment being considered for purchase. 

Rather then going off your 3-d body measurements, go off the measurments of the items in your wardrobe that you like the fit of, becasue its not neccicarily about the shape of you but more so the shape of the items you are putting around you that is significant here. so take your clothes that you most like the fit of on you and measure them. 

In order to take the measurements,  lay your item flat and measure them under the arms, across the waist, across the bottom hems as well as the length.

also taking the measurement of the space between the shoulder seams of jackets and the inseam of pants can be helpful too.

and please- always reach out before purchasing if you have any questions about the fit and size. 

below is a illistrated guide to the ways in which I measure:)