will these fit RWP knee pads?

CLC Custom Leathercraft G361 Professional Ultra-Flex Gel Kneepads These are the kind of knee pads that they fit. Just put them over the buttons bottom and top.

soft rubber straps or hard rubber? Comfortable without long pants ?

It is hard to classify your description of the rubber being soft or hard. The straps have enough elasticity to be pulled an inch or so to hook over the knob on the pads themselves. Can the pads be worn with shorts (or naked), with these straps? Yes. Are they "comfortable"? Define: Comfortable. To me maybe they are, to you maybe not. YMMV. I have found no need nor desire to wear them without clothes.

Will these fit mcguire nicholas 1dm-361 knee pads?

I don't know about your specific knee pads but I'm very happy with these straps. They are sturdy and comfortable and much stronger than the originals. There seems to be a lot of variance in adjustment so I'd take a chance. I would recommend them and would buy them again for all my various knee pads

Will these fit the CLC gel knee pads?

It will depend on which style of CLC knee pads that you have. The pads need to have attachment points on both sides of the pad. Like the CLC Custom Leathercraft 362 Ultraflex Non-Skid Kneepads. If it is one of the many other style of CLC pads where the straps are fixed on one side or the straps buckle, then it would require some "Jerry Rigging" to get these to work. I use them on another manufactures pads and these straps work great and in fact are far superior to the original. I hope this answers your question.