DT100 velours do fit fine without any mods, but if I were you, I would wait to see if stock pleathers are uncomfy for you or not. Velours are more comfy but they still feel kind of strange due that rectangle earcup shape, and they're not any softer than stock pads. Also sound is changed quite a lot with velours, it's smoother and less exciting imo. I myself started with DT100 velours and liked it a lot, but nowadays I've come to prefer pleather pads on DT150, currently using HM5 angled pleather pads. I think Thomann still sells DT100 velours if you want to try them though. Comfort increasing tip for DT150, if you find the clamping force too tight, you can always reduce it by bending the headband. Hope this helps! Cheers!