What articles of clothing and accessories are recommended for a guy to feel the most feminine? Because in all honesty I'm not sure of everything a woman wears.

Well why clothes? maybe a nice bubble bath, or if you can, polish your toe nails, shave the legs. All of this is invisible if you are not out and can feel fantastic.

Many women like to pamper themselves, sure on HRT your skin feels different and such pampering is so much better, but in the mean time just relax and enjoy.

Shave legs (if you haven't) and wear a panty, or a legging.
And as Cindy said, it can be hidden, so no worries.