[itsCody]

PHP код:

#define DIALOG_CONFIRM 1337
new WhatModelID[MAX_PLAYERS];
public OnPlayerModelSelection(playerid, response, listid, modelid)
{
    if(listid == skinlisthere)
    {
        if(response)
        {
            WhatModelID[playerid] = modelid;
            ShowPlayerDialog(playerid, DIALOG_CONFIRM, 0, "Confirm", "Are you sure you want to buy these clothes?", "Yes", "No");
        }
        else
        {
            SendClientMessage(playerid, -1, "Cancelled");
        }
        return 1;
    }
    return 1;
}
public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    if(dialogid == DIALOG_CONFIRM)
    {
        if(response)
        {
            SetPlayerSkin(playerid, WhatModelID[playerid]);
            // rest of your code
        }
        else SendClientMessage(playerid, -1, "Cancelled");
    }
    return 1;
} 


Code improvements can be made.