Did you use any kind of lube? Last year I used a pair of just-bought PI tri shorts in a Oly race (forgot to pack shorts for the Chicago Tri). Put a lot of Body Glide and had no problems whatsoever.
Yeah, I thought the PI tri shorts sucked. I’ve never had a chamois that felt quite like the sandpaper like chamois in the PI tri shorts. They suck. Get Oomph! shorts which are infinitely better than any other tri shorts I have used (sugoi, desoto, PI).
it sounds as if you might be working with one or two factors:
there was some residual whatever left on the new, unwashed material, and it didn’t agree with your skin in race conditions. washing ought to get rid of that.
your skin just decided that it was going to get persnickity. sometimes my fail-safe method of lubrication, squeaky clean shorts and body, etc., etc., just tanks and i get a saddle sore. just on accounta because. and then i deal with it and it goes away in a few days. who knows why.
summary: i wouldn’t give up on costly shorts after just one (admittedly bad) experience. give it a few tries.
peggy