Amazon EssentialsSlim-Fit Long Sleeve Shirt for Men, Pocket and No Pocket Styles

Why do the no-pocket shirts cost more than the ones with pockets?

If im a girl buying this and want it a litrle looser should i get medium or small??

Does the collar lay flat? Some cheaper brands have collars that aren't designed well to stay flat - they tend to roll

How large is the pocket? Asking to iron something on