At a Johnny Cupcakes store or at www.johnnycupcakes.com
target
Go to a local store, and buy a cupcake tray.
make cupcake
Anywhere you want, Baby
You won't find suits that you can buy with a shirt and tie together, but you can buy sets of shirt and ties.
you buy batter and frosting then put the frosting on the cupcake
At Target or you can check online.
buy one in a bag store.
Down towards the bottom of the screen, there is a little picture of a cupcake in a circle. It will be right beside the bar that shows what your Sim needs (toilet, eating, interaction etc). Tap on that and it will prompt you to buy a cupcake with 5 lp. Buy it and it's done.
Let a shirt be bought for me.
Johnny ertl
You can't force people to buy your shirt however if it is goodenoughpeople will want to buy it and if you have the money you can advertise it to get it noticed quicker.