Muscle tee’s are sooo comfy, I’ve been living in them recently.
Start off with an old oversized tee. I think I cleaned the house in mine, because it had bleach stains on it.
You can use anything to embellish the collar of your tee, rhinestones, beads, leather, pearls, whateves. I happen to love Peter Pan collars, and I have a bunch of scrap fabric left over from necklaces that I had listed on Etsy (should I bring them back this fall?). If you want to do a Pan collar, just google templates and use them with whatever fabric you like.
I’m feelin the collared muscle tee. Pop a collar on anything and you fancy.