I'll admit you're right Penlowe, unless of course someone's going for tightness as a fetish thing. Which normally I wouldn't bring up, but it is Mad Love Harley Quinn, the originator of many a person's latex fetish. :P
To OP, you've got the general idea right for getting a garment more fitted. It's how I tweaked my skirt for Wicke, which I wanted as form-fitting as I could get it. Do be sure to try it on before cutting the excess first to make sure it doesn't change the shape somewhere else though. It may fit a little off with the excess still there but you don't want to find out after the fact that it's now too tight.
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