i like being in basketball shorts...i lower them below my balls when stroking and the pressure from them makes the orgasm pretty intense

Naked is top choice. That said, I make sure to cum in every pair of underwear I own.

Naked now, naked always

naked is best for going for it. edge in boxers then come off

Naked

I am naked at the masturbation from the belt, so I can see the penis well.
Occasionally masturbate even before a shaving mirror. There I can see my penis magnificently enlarged. Stimulating it for me when I see my foreskin glide over the glans. Also I can then change the angle of view, and thus observe the penis times from a very different perspective. Of course, I have also made many pictures of my penis. Looking at these pictures excited me a lot.

As a teen I would normally wank in bed on an evening, and developed a habit of pulling my pyjama top up when i was ready to cum, and a habit I've kept. I will keep a t-shirt on when I'm masturbating and edging, and pause when I'm ready to finish, to pull my shirt up..which adds to the experience for me, and the anticipation of the imminent moments of ecstasy to "cum".

Absolutely nothing at all! I hate to even have to get dressed!

It is fun at an Adult porn store to just have pants down just enough to expose your dick and balls and jack and cum on stall floor!

Nothing, completely naked best for me

Panties and bra...lol

Naked

I pull my panties down or to the side and i have a dildo i suck

I am shirtless, with athletic shorts on all the time around the house or in a hotel. It's easy to rub my cock through the shorts, to pull my cock out to stroke it, or lose the shorts altogether, depending on the privacy I have at that moment. Always feels best naked in front of a mirror. Keep stroking.

Just trousers & undies down. Sometimes just enough to do the business, or trousers right down and briefs stretched between the knees. Something erotic about that, don't know why. Like to see females in a similar state, say if they're on the toilet having a wee.