I wear a 10 regular width in street shoes, my Riedell skates are a 9.5A and they fit perfectly. I ordered my Reidells off eBay, they are an older model 355 Silver Star. I was very nervous ordering my first pair of "real" skates off eBay but they seemed to be just my size and they were only $100 with MK Silver Star blades attached and had never been skated in. I figured they would be a fabulous deal if they fit and if they did not, $100 was not the worst thing. I was gong to try to resell them if they didn't fit.
Prior to ordering them I went to Kenzie's Closet and checked out the Riedell size chart. That chart was very accurate for me, I measured my foot length just over 10" and my width 9-9 1/8" which fell within the 9.5A range. When I first got them I thought they were too small, both width and length. I switched my socks to thin trouser socks and then they felt ok, snug but not horrible, I could wiggle my toes a bit. It took about ten skates to break then in and now they feel like an extension of my foot, absolutely perfect. Once I broke them in I did notice that the ankles were just a tad loose and the boot was doing some creasing where the flex notch would be. I solved that problem by wearing Bunga pads on my ankles and switched my lacing technique to the one recommended by Edea and that solved both problems.
I adore my Riedells. it seems like I read quite a bit of criticism about them, I rarely meet another Riedell skater, most people at our rink wear Harlicks or Edea. I got extremely lucky with what I paid for mine, I would have paid way more for good quality skates that fit beautifully like these do, I truly love wearing them.