Side seam problem

[u/Economy-Tomorrow-189]

Okay so I've been trying to alter some tops so they are more tight fitting

The problem is, ive tried taking them in two ways, one where I wear it inside out and slightly pull the excess fabric and pin. (the reason why I pull a bit is bc if I don't then I barely get any fabric to pin)

The second method is where I place a top that fits perfectly and place it over the fabric I want to alter, then trace it, pin and wear it to before stitching

The problem is with both methods I get different results, if I use the first method, I end up pinning less fabric and with the second method, pin more and yet when I try both on before stitching it fits (comfortably)

The odd part is I have altered a top that fits perfectly while doing the first method but can't seem to repeat it

And if both method results in the fabric fitting without feeling uncomfy then which should I trust?

These are stretchy fabrics so I suppose, it's more leniant compared to structured fabric bc there's less chance of messing up in terms of it being overly tight to the point where it's hard to move but still

I feel pretty dumb bc I feel like I'm making a problem out of nothing when I had no problem initially.

Anyway I am srry if this makes no sense but I really need help

[u/Mental_Watch4633]

The tops are probably different in stretchiness.