Olive Loves AppleBold Big Sister Colorful Sibling Reveal Announcement T-Shirt for Baby and Toddler Girls Sibling Outfits

What material is this? Does it shrink?

What size would a size 7?

Are the letters iron on vinyl like what you can do yourself with a cricut, or are they screenprinted where you cannot feel them and they wont peel?

Will this fit a large cat?