Derpy struts in. "Imma be most hansome dwagon ever!"

This is the fabric I bought. The print might still be a little large, but it's so cute!
https://s26.postimg.org/a6aj6emsp/20171025_151558.jpg

I made shirts for my peg dolls but they were itty bitty since they were adorning old fashioned clothes pegs and pipecleaners. I imagine all you'd need to do is have a good look at one of your shirts and see where the seams fall. That should give you and idea for what sort of pieces you need and where to sew them.

But they're messy.

I'm thinking I'll just pin the original shirt down, lightly trace around the edges, cut two, and sew up the sides. And then just do a tiny hem along the neck for the collar.

awwwww!! That's soo adorable! Derpy will look so cute in that!

Sounds like a plan. At least it saves the hassle of properly inserting sleeves.

Imagine Derpy in a wife beater

The patter I used for my dolls was to fold a bit of fabric in half, cut a T shape with the fold at the top of the T. Cut a head hole in the fold, pop it over the head, and wrap the arms of the T around for sleeves, and the stem of the T around the waist and sew the sides together. Might have to cut and trim as needed but it did work. At least, it worked when your shirt was maybe a couple inches long.

Derpy does not deserve wife-beaters! He's a classy dragon.

what if Derpy wants to show his guns

Then he has a holster overtop of a suitable manly t-shirt or blouse.

Thanks for the tip, Quiet! I think I have a good plan for how to cut it now! And fear not, mdom! I should have enough fabric to also make a sleeveless top.
XD
Probably similar to a tunic.

It has to tight to show Derpy's muscles! xD the ones he's been cultivating when he goes to the gym while you work.

Lol. Cutscene to Derpy bench pressing the cats to the Rocky theme.

Dulph Derpy!

and the cats looking ????

a good looking guy, Derpy xD